CVE-2025-65493
HIGHCVSS 7.5/10EPSS 0.33%
Last modified
CVE-2025-65493 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libcoap | Libcoap | 4.3.5 |
References
- https://github.com/obgm/libcoap/issues/1743Issue Tracking
- https://github.com/obgm/libcoap/pull/1750Issue Tracking, Patch
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-65493?
NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.
How severe is CVE-2025-65493?
CVE-2025-65493 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2025-65493?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2025-65493?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST