CVE-2022-31031Network attack vector

Memory corruption via unbounded STUN attribute parsing

Published Jun 7, 2022 · Updated Nov 4, 2025

Stack-based buffer overflow in PJSIP PJPROJECT 2.12.1 and earlier allows remote attackers to corrupt memory via crafted STUN responses. pjstun_parse_msg writes each parsed attribute pointer into the fixed-size msg->attr array without stopping when attr_count reaches its capacity. Reachability requires a configured STUN server at the PJSUA/PJSUA2 level or direct use of pjlib-util/stun_simple; public sources do not demonstrate code execution.

CVSS severity9.8
Critical
EPSS probability2.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in PJSIP PJPROJECT 2.12.1 and earlier allows remote attackers to corrupt memory via crafted STUN responses. pjstun_parse_msg writes each parsed attribute pointer into the fixed-size msg->attr array without stopping when attr_count reaches its capacity. Reachability requires a configured STUN server at the PJSUA/PJSUA2 level or direct use of pjlib-util/stun_simple; public sources do not demonstrate code execution.

The record

CVE
CVE-2022-31031
Published
Jun 7, 2022
Updated
Nov 4, 2025
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-121, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 7, 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=<= 2.12.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=<= 2.12.1

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/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 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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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