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CVE-2025-66577

18
FAUCET Score

CVE-2025-66577 is a log poisoning vulnerability affecting cpp-httplib versions prior to 0.27.0, a C++11 HTTP/HTTPS library. Attackers can manipulate HTTP headers like X-Forwarded-For to spoof client IP addresses, leading to inaccurate server logs and potentially evading audit trails. This medium-severity vulnerability (CVSS 5.3) is network-exploitable with low complexity, impacting integrity by allowing attackers to falsify log data. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.27.0CPE matchmatch criteria
cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.24%
Probability of exploitation in next 30 days
EPSS Percentile
15.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0024 is in the 7th percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff
Patch
github.com / yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2
ExploitThird Party Advisory