Dashboard / CVE-2025-65493

CVE-2025-65493

HIGH
MEDIUM Priority: 0.03 BB Relevance: 75/100
Published: 2025-11-24 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
libcoap libcoap 4.3.5

References & Advisories (2)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.40%
Raw Score 0.004050
Percentile 35.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00405
2026-11-12
0.00405
2026-11-10
0.00405
2026-11-09
0.00405
2026-11-08
0.00405
2026-11-07
0.00405
2026-11-06
0.00405
2026-11-05
0.00405
2026-11-04
0.00405

Intelligence Sources

nvd ref →

External Links