CVE-2025-65499

MEDIUMNVD 4.34.3—Trending — 3 sources updated this week

4.3

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.

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 34.1%
KEV: Not listed

Published

November 24, 2025

Last Modified

December 1, 2025

References (2)

cve@mitrehttps://github.com/obgm/libcoap/issues/1747
cve@mitrehttps://github.com/obgm/libcoap/pull/1750

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-129Improper Validation of Array Index

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 18:56 UTCEG score recompute
2026-05-29 18:55 UTCGHSA enrichment
2026-05-29 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2025-65499?

CVE-2025-65499 is a medium vulnerability published on November 24, 2025. Array index error in tlsverifycallback() in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSLgetexdataX509STORECTX_idx() to return -1.

When was CVE-2025-65499 disclosed?

CVE-2025-65499 was first published in the National Vulnerability Database on November 24, 2025, with the most recent update on December 1, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-65499 actively exploited?

CVE-2025-65499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-65499?

CVE-2025-65499 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2025-65499?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-65499, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-65499

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-65499?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)