CVE-2021-3942

Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of Link-Local Multicast Name Resolution or LLMNR.

Published: 2022-12-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3942 is rated Moderate Risk (63.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.39%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3942

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.73% 1.39% +0.66%
2 2025-12-24 2.28% 0.73% -1.55%
3 2025-12-23 — 2.28% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3942

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2021-3942

Affected software / configurations for CVE-2021-3942

Vendor Product Version Raw CPE
hp color_laserjet_cm4540_mfp_cc419a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc419a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_cm4540_mfp_cc420a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc420a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_cm4540_mfp_cc421a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm4540_mfp_cc421a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_cm5525_mfp_ce707a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce707a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_cm5525_mfp_ce708a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce708a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_cm5525_mfp_ce709a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_cm5525_mfp_ce709a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu85a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu85a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu85a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu85a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu86a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu86a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu86a_firmware >= 5.0.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu86a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu87a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu87a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu87a_firmware >= 5.0.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu87a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu88a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu88a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m578_mfp_7zu88a_firmware >= 5.0.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m578_mfp_7zu88a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_d7p70a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_d7p70a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_d7p70a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_d7p70a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_a2w75a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_a2w75a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_a2w75a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_a2w75a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_a2w76a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_a2w76a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_a2w76a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_a2w76a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_d7p71a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_d7p71a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_d7p71a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_d7p71a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_l3u51a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_l3u51a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_l3u51a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_l3u51a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_l3u52a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_l3u52a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_flow_mfp_m880z_l3u52a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_flow_mfp_m880z_l3u52a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_d7p70a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_d7p70a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_d7p70a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_d7p70a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_a2w75a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_a2w75a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_a2w75a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_a2w75a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_a2w76a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_a2w76a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_a2w76a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_a2w76a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_d7p71a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_d7p71a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_d7p71a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_d7p71a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_l3u51a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_l3u51a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_l3u51a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_l3u51a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_l3u52a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_l3u52a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_flow_mfp_m880zm_l3u52a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_flow_mfp_m880zm_l3u52a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m455_39z95a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m455_39z95a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m552_b5l23a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_m552_b5l23a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m552_b5l23a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_m552_b5l23a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_m552_b5l23a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_m552_b5l23a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l24a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l24a_firmware >= 4.0, < 4.11.23 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l24a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l25a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l25a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l25a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l26a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l26a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l26a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l27a_firmware < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l27a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l27a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l38a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l38a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l38a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l39a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l39a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l39a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l39a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l39a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l39a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l24a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l24a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l24a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l24a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l25a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l25a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l25a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l25a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l26a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l26a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l26a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l26a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l27a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l27a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l27a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l27a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l38a_firmware >= 3.0, < 3.9.9 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l38a_firmware >= 4.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_managed_m553_b5l38a_firmware >= 5.0, < 5.4 cpe:2.3:o:hp:color_laserjet_managed_m553_b5l38a_firmware:*:*:*:*:*:*:*:*
hp color_laserjet_enterprise_m553_b5l39a_firmware >= 4.0.0, < 4.11.2.3 cpe:2.3:o:hp:color_laserjet_enterprise_m553_b5l39a_firmware:*:*:*:*:*:*:*:*
hp designjet_t2600_36\"_mfp_3ek15a_firmware < 08_22_11.1 cpe:2.3:o:hp:designjet_t2600_36\"_mfp_3ek15a_firmware:*:*:*:*:*:*:*:*
hp designjet_t2600_36\"_mfp_3ek15b_firmware < 08_22_11.1 cpe:2.3:o:hp:designjet_t2600_36\"_mfp_3ek15b_firmware:*:*:*:*:*:*:*:*
hp designjet_t2600_36\"_mfp_3ek15k_firmware < 08_22_11.1 cpe:2.3:o:hp:designjet_t2600_36\"_mfp_3ek15k_firmware:*:*:*:*:*:*:*:*
hp designjet_t2600_36\"_mfp_3xb77a_firmware < 08_22_11.1 cpe:2.3:o:hp:designjet_t2600_36\"_mfp_3xb77a_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-3942

cvelogic Threat Intelligence