CVE-2022-21722Network attack vector

Memory disclosure and crashes via truncated RTP/RTCP packets

Published Jan 27, 2022 · Updated Nov 4, 2025

Out-of-bounds reads in PJMEDIA in PJSIP PJPROJECT 2.11.1 and earlier allow remote attackers to read memory via RTP/RTCP packets. The RTP and RTCP parsers access extension headers, report structures, and feedback counts before fully validating packet lengths. Any PJMEDIA application accepting incoming RTP or RTCP is exposed, and crafted truncated packets can disclose adjacent process memory or crash the process.

CVSS severity9.1
Critical
EPSS probability2.40%
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 reads in PJMEDIA in PJSIP PJPROJECT 2.11.1 and earlier allow remote attackers to read memory via RTP/RTCP packets. The RTP and RTCP parsers access extension headers, report structures, and feedback counts before fully validating packet lengths. Any PJMEDIA application accepting incoming RTP or RTCP is exposed, and crafted truncated packets can disclose adjacent process memory or crash the process.

The record

CVE
CVE-2022-21722
Published
Jan 27, 2022
Updated
Nov 4, 2025
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-125
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

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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

Public exploit references

No public exploit references are available in this record.

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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