CVE-2025-65496

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Source
https://cve.org/CVERecord?id=CVE-2025-65496
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-65496.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-65496
Downstream
Related
Published
2025-11-24T00:00:00Z
Modified
2026-08-12T03:51:28Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/65xxx/CVE-2025-65496.json"
}
References

Affected packages

Git / github.com/obgm/libcoap

Affected ranges

Type
GIT
Repo
https://github.com/obgm/libcoap
Events
Introduced
851533c3cf63d16984d370ce39d586ecb3694971
Last Affected
851533c3cf63d16984d370ce39d586ecb3694971
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:libcoap:libcoap:4.3.5:-:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.3.5-NA"
        },
        {
            "last_affected": "4.3.5-NA"
        }
    ],
    "source": "CPE_STRING"
}

Affected versions

4.*
4.3.5-NA
v4.*
v4.3.5b

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-65496.json"