CVE-2023-32307Public exploitNetwork attack vector

Application crash via unchecked STUN attribute lengths

Published May 26, 2023 · Updated Feb 13, 2025

Heap buffer and integer overflows in Sofia-SIP 1.13.14 and earlier allow remote attackers to crash applications via crafted STUN packets. The stun_parse_attr_error_code and stun_parse_attr_uint32 functions read four-byte values and derive allocation or copy lengths without first requiring four bytes of attribute data. Exploitation requires an application to pass attacker-controlled STUN traffic to the affected parser and can cause an out-of-bounds read, excessive allocation, or process termination.

CVSS severity7.5
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer and integer overflows in Sofia-SIP 1.13.14 and earlier allow remote attackers to crash applications via crafted STUN packets. The stun_parse_attr_error_code and stun_parse_attr_uint32 functions read four-byte values and derive allocation or copy lengths without first requiring four bytes of attribute data. Exploitation requires an application to pass attacker-controlled STUN traffic to the affected parser and can cause an out-of-bounds read, excessive allocation, or process termination.

The record

CVE
CVE-2023-32307
Published
May 26, 2023
Updated
Feb 13, 2025
Vendor
FreeSWITCH
Product
Sofia-SIP
Classifications
CWE-787, CWE-190, CWE-122, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=< 1.13.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeSWITCH · Sofia-SIPversion=< 1.13.15

Published CVSS scores

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-190Integer Overflow or Wraparound
CWE-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

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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