CVE-2022-21723Network attack vector

Memory disclosure or crash via unchecked scanner pointer

Published Jan 27, 2022 · Updated Nov 4, 2025

Out-of-bounds read in PJPROJECT 2.11.1 and earlier allows remote attackers to disclose memory or crash processes via malformed SIP multipart messages. In pjsip_multipart_parse(), a malformed boundary can drive pj_scan_get_char() to dereference scanner->curptr before checking it against scanner->end. The input must reach an application that accepts SIP multipart; the over-read can disclose adjacent process memory or terminate the process.

CVSS severity9.1
Critical
EPSS probability4.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in PJPROJECT 2.11.1 and earlier allows remote attackers to disclose memory or crash processes via malformed SIP multipart messages. In pjsip_multipart_parse(), a malformed boundary can drive pj_scan_get_char() to dereference scanner->curptr before checking it against scanner->end. The input must reach an application that accepts SIP multipart; the over-read can disclose adjacent process memory or terminate the process.

The record

CVE
CVE-2022-21723
Published
Jan 27, 2022
Updated
Nov 4, 2025
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 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

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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