CVE-2022-23608Network attack vector

Application hang via stale dialog-set hash key

Published Feb 22, 2022 · Updated Nov 4, 2025

Use-after-free in PJSIP PJPROJECT 2.11.1 and earlier allows remote attackers to hang SIP applications through a dialog-set collision. pjsip_ua_unregister_dlg leaves a dialog set indexed by tag storage owned by a destroyed dialog instead of replacing the hash key with a surviving dialog's tag. A reachable SIP user agent must enter a forked dialog set and destroy the key-owning dialog; duplicate hash registrations can then collide and loop indefinitely.

CVSS severity8.1
High
EPSS probability4.06%
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 PJSIP PJPROJECT 2.11.1 and earlier allows remote attackers to hang SIP applications through a dialog-set collision. pjsip_ua_unregister_dlg leaves a dialog set indexed by tag storage owned by a destroyed dialog instead of replacing the hash key with a surviving dialog's tag. A reachable SIP user agent must enter a forked dialog set and destroy the key-owning dialog; duplicate hash registrations can then collide and loop indefinitely.

The record

CVE
CVE-2022-23608
Published
Feb 22, 2022
Updated
Nov 4, 2025
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=<= 2.11.1

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
8.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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