How severe is CVE-2025-65494?

CVE-2025-65494 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-65494 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65494?

CVE-2025-65494 affects Libcoap. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65494?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-65494 have an EU (EUVD) identifier?

Yes. CVE-2025-65494 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198715.

When was CVE-2025-65494 published?

CVE-2025-65494 was published on 2025-11-24 and last updated on 2026-06-17.

CVE-2025-65494

CVE-2025-65494 is a high-severity vulnerability in Libcoap with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198715
Weakness: CWE-476
Affected product: Libcoap
Published: 2025-11-24
Last modified: 2026-06-17

Description

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

Frequently asked questions

What is CVE-2025-65494?: NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.
How severe is CVE-2025-65494?: CVE-2025-65494 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-65494 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65494?: CVE-2025-65494 affects Libcoap. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65494?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-65494 have an EU (EUVD) identifier?: Yes. CVE-2025-65494 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198715.
When was CVE-2025-65494 published?: CVE-2025-65494 was published on 2025-11-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*

More vulnerabilities in Libcoap

CVE-2026-29013 — Critical (CVSS 9.8): libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in…
CVE-2025-34468 — Critical (CVSS 9.8): libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address…
CVE-2025-65495 — High (CVSS 7.5): Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers…
CVE-2025-65493 — High (CVSS 7.5): NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of…
CVE-2024-31031 — High (CVSS 7.5): An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages…
CVE-2023-30362 — High (CVSS 7.5): Buffer Overflow vulnerability in coap_send function in libcoap library 4.3.1-103-g52cfd56 fixed in 4.3.1-120-ge242200…

All CVEs affecting Libcoap →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →