Vulnerability · Published Nov 24, 2025 · Assigned by mitre
CVE-2025-65493
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 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 65.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libcoap3 | no fix listed | DEBIAN-CVE-2025-65493 |
| Debian:13 | libcoap3 | 4.3.4-1.1+deb13u2 | DEBIAN-CVE-2025-65493 |
| Debian:14 | libcoap3 | 4.3.5-2 | DEBIAN-CVE-2025-65493 |
| Ubuntu:22.04:LTS | libcoap2 | no fix listed | UBUNTU-CVE-2025-65493 |
| Ubuntu:22.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65493 |
| Ubuntu:24.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65493 |
| Ubuntu:25.10 | libcoap3 | no fix listed | UBUNTU-CVE-2025-65493 |
| Ubuntu:26.04:LTS | libcoap3 | no fix listed | UBUNTU-CVE-2025-65493 |
| Ubuntu:26.10 | libcoap3 | no fix listed | UBUNTU-CVE-2025-65493 |
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