CVE-2022-31002Public exploitNetwork attack vector

Remote service crash via terminal percent sign

Published May 31, 2022 · Updated Apr 22, 2025

Out-of-bounds reads in FreeSWITCH Sofia-SIP before 1.13.8 allow remote attackers to crash SIP applications with a crafted message. The url_canonize2 and url_canonize3 functions read the two expected hexadecimal bytes after a terminal percent sign without first checking that the first byte exists. No authentication or user interaction is required; parsing the malformed SIP URL can terminate the consuming process and interrupt its service.

CVSS severity7.5
High
EPSS probability1.90%
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 FreeSWITCH Sofia-SIP before 1.13.8 allow remote attackers to crash SIP applications with a crafted message. The url_canonize2 and url_canonize3 functions read the two expected hexadecimal bytes after a terminal percent sign without first checking that the first byte exists. No authentication or user interaction is required; parsing the malformed SIP URL can terminate the consuming process and interrupt its service.

The record

CVE
CVE-2022-31002
Published
May 31, 2022
Updated
Apr 22, 2025
Vendor
FreeSWITCH
Product
Sofia-SIP
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=< 1.13.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeSWITCH · Sofia-SIPversion=< 1.13.8

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 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 exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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