What is CVE-2025-65502?

CVE-2025-65502 is a medium-severity vulnerability in Cesanta Mongoose, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2025-11-24.

How severe is CVE-2025-65502?

Medium severity. CVSS v3 base score is 4.3 out of 10.

NULL pointer dereference in Cesanta Mongoose

CVE-2025-65502

Null pointer dereference in add_ca_certs() in Cesanta Mongoose before 7.2 allows remote attackers to cause a denial of service via TLS initialization where SSL_CTX_get_cert_store() returns NULL.

Published 2025-11-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (18.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.8% 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

Cesanta Mongoose

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/cesanta/mongoose/issues/3306 (Exploit, Issue Tracking)
github.com/cesanta/mongoose/pull/3307 (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2025-65502?: CVE-2025-65502 is a medium-severity vulnerability in Cesanta Mongoose, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2025-11-24.
How severe is CVE-2025-65502?: Medium severity. CVSS v3 base score is 4.3 out of 10.