libcoap 4.3.5 OSCORE Configuration Parser out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.4$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in libcoap 4.3.5. This vulnerability affects unknown code of the component OSCORE Configuration Parser. Executing a manipulation can lead to out-of-bounds. This vulnerability is registered as CVE-2025-59391. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in libcoap 4.3.5. This vulnerability affects an unknown function of the component OSCORE Configuration Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2025-59391 since 09/15/2025. The exploitation appears to be easy. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 277783 (Linux Distros Unpatched Vulnerability : CVE-2025-59391), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.3.5a eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (277783). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 277783
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-59391

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: libcoap 4.3.5a
Patch: github.com

Timelineinfo

09/15/2025 CVE reserved
12/08/2025 +84 days Advisory disclosed
12/08/2025 +0 days VulDB entry created
12/09/2025 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-59391 (🔒)
GCVE (CVE): GCVE-0-2025-59391
GCVE (VulDB): GCVE-100-334810

Entryinfo

Created: 12/08/2025 19:29
Updated: 12/09/2025 05:45
Changes: 12/08/2025 19:29 (56), 12/09/2025 05:45 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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