libcoap coap_pdu.c coap_delete_pdu_lkd use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in libcoap and classified as critical. This affects the function coap_delete_pdu_lkd of the file coap_pdu.c. Executing a manipulation can lead to use after free. This vulnerability is tracked as CVE-2025-50518. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in libcoap (the affected version is unknown). This vulnerability affects the function coap_delete_pdu_lkd of the file coap_pdu.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code.

This vulnerability was named CVE-2025-50518 since 06/16/2025. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/02/2025).

The vulnerability scanner Nessus provides a plugin with the ID 259996 (Linux Distros Unpatched Vulnerability : CVE-2025-50518), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (259996). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / 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: 259996
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-50518

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/16/2025 CVE reserved
08/14/2025 +59 days Advisory disclosed
08/14/2025 +0 days VulDB entry created
09/02/2025 +19 days VulDB entry last update

Sourcesinfo

Status: Not defined

CVE: CVE-2025-50518 (🔒)
GCVE (CVE): GCVE-0-2025-50518
GCVE (VulDB): GCVE-100-320212

Entryinfo

Created: 08/14/2025 19:56
Updated: 09/02/2025 15:40
Changes: 08/14/2025 19:56 (51), 09/01/2025 05:28 (2), 09/02/2025 15:40 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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