CVE-2025-65497 | Vulnetix

CVE-2025-65497 PUBLISHED CVSS 4.3 MEDIUM

Reported by mitre · Published November 24, 2025

NULL pointer dereference in coap_dtls_generate_cookie() 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_SSL_CTX() to return NULL.

Risk scores

CVSS 3.1

4.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

Vendor	Product	Versions
n/a	n/a	n/a
n/a	n/a	*

Timeline

Nov 24, 2025 CVE Published
Nov 24, 2025 CVE Updated
Nov 25, 2025 EPSS Score (30 in total, the first dated here)
Mar 26, 2026 Coalition ESS Score (2 in total, the first dated here)
Apr 2, 2026 Security Advisory

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2025-65497
vulnetix vdb fixes CVE-2025-65497

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curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-65497/fixes/registry"

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References

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