CVE-2021-29998

An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.

Published: 2021-04-13 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-29998 is rated High Risk (65.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.81%). High exploitation likelihood—assess exposure and prioritize 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-2021-29998

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 2026-04-15 0.60% 0.81% +0.21%
2 2026-01-26 0.72% 0.60% -0.12%
3 2025-11-21 — 0.72% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-29998

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]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-29998

Affected software / configurations for CVE-2021-29998

Vendor Product Version Raw CPE
windriver vxworks < 6.5 cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
siemens ruggedcom_win_subscriber_station_firmware — cpe:2.3:o:siemens:ruggedcom_win_subscriber_station_firmware:*:*:*:*:*:*:*:*
siemens scalance_x200-4_p_irt_firmware — cpe:2.3:o:siemens:scalance_x200-4_p_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_x201-3p_irt_firmware — cpe:2.3:o:siemens:scalance_x201-3p_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_x201-3p_irt_pro_firmware — cpe:2.3:o:siemens:scalance_x201-3p_irt_pro_firmware:*:*:*:*:*:*:*:*
siemens scalance_x202-2_irt_firmware — cpe:2.3:o:siemens:scalance_x202-2_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_x202-2p_irt_firmware — cpe:2.3:o:siemens:scalance_x202-2p_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_x202-2p_irt_pro_firmware — cpe:2.3:o:siemens:scalance_x202-2p_irt_pro_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204_irt_firmware — cpe:2.3:o:siemens:scalance_x204_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204_irt_pro_firmware — cpe:2.3:o:siemens:scalance_x204_irt_pro_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204-2_firmware — cpe:2.3:o:siemens:scalance_x204-2_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204-2fm_firmware — cpe:2.3:o:siemens:scalance_x204-2fm_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204-2ld_firmware — cpe:2.3:o:siemens:scalance_x204-2ld_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204-2ld_ts_firmware — cpe:2.3:o:siemens:scalance_x204-2ld_ts_firmware:*:*:*:*:*:*:*:*
siemens scalance_x204-2ts_firmware — cpe:2.3:o:siemens:scalance_x204-2ts_firmware:*:*:*:*:*:*:*:*
siemens scalance_x206-1_firmware — cpe:2.3:o:siemens:scalance_x206-1_firmware:*:*:*:*:*:*:*:*
siemens scalance_x206-1ld_firmware — cpe:2.3:o:siemens:scalance_x206-1ld_firmware:*:*:*:*:*:*:*:*
siemens scalance_x208_firmware — cpe:2.3:o:siemens:scalance_x208_firmware:*:*:*:*:*:*:*:*
siemens scalance_x208_pro_firmware — cpe:2.3:o:siemens:scalance_x208_pro_firmware:*:*:*:*:*:*:*:*
siemens scalance_x212-2_firmware — cpe:2.3:o:siemens:scalance_x212-2_firmware:*:*:*:*:*:*:*:*
siemens scalance_x212-2ld_firmware — cpe:2.3:o:siemens:scalance_x212-2ld_firmware:*:*:*:*:*:*:*:*
siemens scalance_x216_firmware — cpe:2.3:o:siemens:scalance_x216_firmware:*:*:*:*:*:*:*:*
siemens scalance_x224_firmware — cpe:2.3:o:siemens:scalance_x224_firmware:*:*:*:*:*:*:*:*
siemens scalance_x300_firmware — cpe:2.3:o:siemens:scalance_x300_firmware:*:*:*:*:*:*:*:*
siemens scalance_x408_firmware — cpe:2.3:o:siemens:scalance_x408_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf201-3p_irt_firmware — cpe:2.3:o:siemens:scalance_xf201-3p_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf202-2p_irt_firmware — cpe:2.3:o:siemens:scalance_xf202-2p_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf204_firmware — cpe:2.3:o:siemens:scalance_xf204_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf204_irt_firmware — cpe:2.3:o:siemens:scalance_xf204_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf204-2_firmware — cpe:2.3:o:siemens:scalance_xf204-2_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf204-2ba_irt_firmware — cpe:2.3:o:siemens:scalance_xf204-2ba_irt_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf206-1_firmware — cpe:2.3:o:siemens:scalance_xf206-1_firmware:*:*:*:*:*:*:*:*
siemens scalance_xf208_firmware — cpe:2.3:o:siemens:scalance_xf208_firmware:*:*:*:*:*:*:*:*
siemens simatic_rf_181_eip_firmware — cpe:2.3:o:siemens:simatic_rf_181_eip_firmware:*:*:*:*:*:*:*:*
siemens simatic_rf_182c_firmware — cpe:2.3:o:siemens:simatic_rf_182c_firmware:*:*:*:*:*:*:*:*
siemens sinamics_perfect_harmony_gh180_firmware >= 2015, < 2022 cpe:2.3:o:siemens:sinamics_perfect_harmony_gh180_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-29998

cvelogic Threat Intelligence