Vulnerability · Published Nov 24, 2025 · Assigned by mitre
CVE-2025-65494
High 7.5
In plain English
A high-severity null pointer dereference in the libcoap3 package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 82.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libcoap3 | no fix listed | DEBIAN-CVE-2025-65494 |
| Debian:13 | libcoap3 | 4.3.4-1.1+deb13u2 | DEBIAN-CVE-2025-65494 |
| Debian:14 | libcoap3 | 4.3.5-2 | DEBIAN-CVE-2025-65494 |
| Ubuntu:22.04:LTS | libcoap2 | no fix listed | UBUNTU-CVE-2025-65494 |
| Ubuntu:22.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65494 |
| Ubuntu:24.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65494 |
| Ubuntu:25.10 | libcoap3 | no fix listed | UBUNTU-CVE-2025-65494 |
| Ubuntu:26.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65494 |
| Ubuntu:26.10 | libcoap3 | no fix listed | UBUNTU-CVE-2025-65494 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H