Dashboard / CVE-2025-65495

CVE-2025-65495

HIGH
MEDIUM Priority: 0.02 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

Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter.

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

0.26%
Raw Score 0.002580
Percentile 17.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00258
2026-11-12
0.00258
2026-11-10
0.00258
2026-11-09
0.00258
2026-11-08
0.00258
2026-11-07
0.00258
2026-11-06
0.00258
2026-11-05
0.00258
2026-11-04
0.00258

Intelligence Sources

nvd ref →

External Links