CVE-2025-59391
CVE-2025-59391 is a medium-severity vulnerability in Libcoap with a CVSS 3.x base score of 6.5. 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-125.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 0% (13th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-201786
- Weakness: CWE-125
- Affected product: Libcoap
- Published:
- Last modified:
Description
A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
Frequently asked questions
- What is CVE-2025-59391?
- A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
- How severe is CVE-2025-59391?
- CVE-2025-59391 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
- Is CVE-2025-59391 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-59391?
- CVE-2025-59391 affects Libcoap. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-59391?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-59391 have an EU (EUVD) identifier?
- Yes. CVE-2025-59391 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201786.
- When was CVE-2025-59391 published?
- CVE-2025-59391 was published on 2025-12-08 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:libcoap:libcoap:*:*:*:*:*:*:*:*
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