CVE-2021-42637

Exp

PrinterLogic Web Stack versions 19.1.1.13 SP9 and below use user-controlled input to craft a URL, resulting in a Server Side Request Forgery (SSRF) vulnerability.

Published: 2022-02-02 Last update: 2026-07-08 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42637 is rated High Exploit Risk (82.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.23%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2021-42637

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-42637

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 2026-07-09 2.27% 2.23% -0.04%
2 2026-06-15 1.47% 2.27% +0.80%
3 2025-07-12 — 1.47% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42637

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-2021-42637

GitHub Security Advisory for CVE-2021-42637

GHSA-gq5h-jhm6-q233 · Severity: critical — PrinterLogic Web Stack versions 19.1.1.13 SP9 and below use user-controlled input to craft a URL,...

Affected software / configurations for CVE-2021-42637

Vendor Product Version Raw CPE
printerlogic web_stack < 19.1.1.13 cpe:2.3:a:printerlogic:web_stack:*:*:*:*:*:*:*:*
printerlogic web_stack 19.1.1.13 cpe:2.3:a:printerlogic:web_stack:19.1.1.13:-:*:*:*:*:*:*
printerlogic web_stack 19.1.1.13 cpe:2.3:a:printerlogic:web_stack:19.1.1.13:sp2:*:*:*:*:*:*
printerlogic web_stack 19.1.1.13 cpe:2.3:a:printerlogic:web_stack:19.1.1.13:sp3-3:*:*:*:*:*:*
printerlogic web_stack 19.1.1.13 cpe:2.3:a:printerlogic:web_stack:19.1.1.13:sp9:*:*:*:*:*:*

References for CVE-2021-42637

URL Tags
https://portswigger.net/daily-swig/printerlogic-vendor-addresses-triple-rce-threat-against-all-connected-endpoints Not Applicable
https://securityaffairs.co/wordpress/127194/security/printerlogic-printer-management-suite-flaws.html Third Party Advisory
https://thecyberthrone.in/2022/01/26/printerlogic-%F0%9F%96%A8-fixes-critical-vulnerabilities-in-its-suite/?utm_source=rss&utm_medium=rss&utm_campaign=printerlogic-%25f0%259f%2596%25a8-fixes-critical-vulnerabilities-in-its-suite Third Party Advisory
https://www.printerlogic.com/security-bulletin/ Vendor Advisory
https://www.securityweek.com/printerlogic-patches-code-execution-flaws-printer-management-suite Third Party Advisory
https://www.yahooinc.com/paranoids/paranoids-vulnerability-research-printerlogic-issues-security-alert/ Exploit Third Party Advisory
cvelogic Threat Intelligence