CVE-2023-27597Public exploitNetwork attack vector

Remote crash via invalid parsed host pointer

Published Mar 15, 2023 · Updated Feb 25, 2025

Improper input validation in OpenSIPS before 3.1.8 and 3.2.0 through 3.2.4 allows remote attackers to crash the server via a crafted SIP URI. parse_uri discards the parsed host pointer for TEL and NENA service URIs, leaving rewrite_ruri to derive a copy position from an unrelated buffer. The unauthenticated network trigger reaches the fault only when routing invokes affected URI-rewrite functions such as setport, and the resulting process crash interrupts SIP service.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in OpenSIPS before 3.1.8 and 3.2.0 through 3.2.4 allows remote attackers to crash the server via a crafted SIP URI. parse_uri discards the parsed host pointer for TEL and NENA service URIs, leaving rewrite_ruri to derive a copy position from an unrelated buffer. The unauthenticated network trigger reaches the fault only when routing invokes affected URI-rewrite functions such as setport, and the resulting process crash interrupts SIP service.

The record

CVE
CVE-2023-27597
Published
Mar 15, 2023
Updated
Feb 25, 2025
Vendor
OpenSIPS
Product
OpenSIPS
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=< 3.1.8
  2. Affected versionversion=>= 3.2.0, < 3.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSIPS · OpenSIPSversion=< 3.1.8; version=>= 3.2.0, < 3.2.5

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-20Improper Input Validation
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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