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CVE-2025-40927

25
FAUCET Score

CVE-2025-40927 is an HTTP response splitting flaw in CGI::Simple versions before 1.282 for Perl, allowing attackers to inject arbitrary HTTP headers or HTML/JavaScript bodies. This vulnerability carries a CVSS score of 7.3 (HIGH) due to its network attack vector, low complexity, and potential for reflected XSS, open redirect, and cache poisoning. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
MANWARCGI::Simple
>= 0, < 1.282CNA affecteddefault unaffected

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 14th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cve.mitre.org / cgi-bin/cvename.cgi
datatracker.ietf.org / doc/html/rfc7230
metacpan.org / release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm
metacpan.org / release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm
owasp.org / www-community/attacks/HTTP_Response_Splitting
rt.perl.org / Public/Bug/Display.html