Dashboard / CVE-2025-65499

CVE-2025-65499

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 59/100
Published: 2025-11-24 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

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

Description

Array index 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 DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
libcoap libcoap 4.3.5

References & Advisories (2)

Bug Bounty Relevance

59 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

4.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS — Exploitation Probability

0.28%
Raw Score 0.002840
Percentile 21.2%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00284
2026-11-12
0.00284
2026-11-10
0.00284
2026-11-09
0.00284
2026-11-08
0.00284
2026-11-07
0.00284
2026-11-06
0.00284
2026-11-05
0.00284
2026-11-04
0.00284

Intelligence Sources

nvd ref →

External Links