CVE-2025-50518Public exploit

Code execution via repeated PDU deletion

Published Aug 14, 2025 · Updated Sep 11, 2025

Use-after-free in libcoap 4.3.5 allows local users to corrupt memory or execute code by deleting the same PDU object twice. coap_delete_pdu_lkd reads the reference counter through a dangling PDU pointer after an earlier call has freed the object. The supplier disputes the vulnerability because the second deletion violates libcoap's API usage requirements; exposure requires an application to retain and delete a stale PDU pointer.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in libcoap 4.3.5 allows local users to corrupt memory or execute code by deleting the same PDU object twice. coap_delete_pdu_lkd reads the reference counter through a dangling PDU pointer after an earlier call has freed the object. The supplier disputes the vulnerability because the second deletion violates libcoap's API usage requirements; exposure requires an application to retain and delete a stale PDU pointer.

The record

CVE
CVE-2025-50518
Published
Aug 14, 2025
Updated
Sep 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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