CVE-2021-42639

Exp

PrinterLogic Web Stack versions 19.1.1.13 SP9 and below are vulnerable to multiple reflected cross site scripting vulnerabilities. Attacker controlled input is reflected back in the page without sanitization.

Published: 2022-02-02 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42639 is rated High Exploit Risk (61.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.15%). 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-2021-42639

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

Exploit prediction scoring system (EPSS) score for CVE-2021-42639

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 2026-06-24 1.14% 1.15% +0.02%
2 2026-06-15 0.89% 1.14% +0.25%
3 2026-02-13 — 0.89% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42639

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-42639

Affected software / configurations for CVE-2021-42639

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-2021-42639

URL Tags
http://printerlogic.com Product
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