What is CVE-2025-63938?

CVE-2025-63938 is a medium-severity vulnerability in Tinyproxy Project, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2025-11-26.

How severe is CVE-2025-63938?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Integer overflow in Tinyproxy Project

CVE-2025-63938

Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within src/reqs.c.

Vulnerability class: Integer Overflow

Published 2025-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Tinyproxy Project

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

github.com/tinyproxy/tinyproxy/issues/586 (Exploit, Patch, Issue Tracking)
github.com/tinyproxy/tinyproxy/commit/3c0fde94981b025271ffa1788ae425257841bf5a (Patch)
github.com/rayinaw/my-hub/blob/main/CVE-2025-63938/DISCLOSURE.md (Third Party Advisory)

Frequently asked questions

What is CVE-2025-63938?: CVE-2025-63938 is a medium-severity vulnerability in Tinyproxy Project, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2025-11-26.
How severe is CVE-2025-63938?: Medium severity. CVSS v3 base score is 6.5 out of 10.