CVE-2024-35190Public exploitNetwork attack vector

Unauthorized calls via local-address endpoint matching

Published May 17, 2024 · Updated Aug 2, 2024

Authentication bypass in Asterisk 18.23.0, 20.8.0, and 21.3.0 allows remote attackers to place unauthorized SIP calls. The added transport identifier passes each request's local destination address, rather than its remote source address, into IP-based endpoint matching. Exploitation requires an endpoint identified by the Asterisk server's own IP address, causing unrelated unauthenticated SIP traffic to inherit that endpoint.

CVSS severity5.8
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Asterisk 18.23.0, 20.8.0, and 21.3.0 allows remote attackers to place unauthorized SIP calls. The added transport identifier passes each request's local destination address, rather than its remote source address, into IP-based endpoint matching. Exploitation requires an endpoint identified by the Asterisk server's own IP address, causing unrelated unauthenticated SIP traffic to inherit that endpoint.

The record

CVE
CVE-2024-35190
Published
May 17, 2024
Updated
Aug 2, 2024
Vendor
Asterisk
Product
Asterisk
Classifications
CWE-670, CWE-303, CWE-480, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 18.23.0
  2. Affected versionversion=18.23.0
  3. Affected versionversion== 20.8.0
  4. Affected versionversion=20.8.0
  5. Affected versionversion== 21.3.0
  6. Affected versionversion=21.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Asterisk · Asteriskversion== 18.23.0; version=18.23.0; version== 20.8.0; version=20.8.0; version== 21.3.0; version=21.3.0

Published CVSS scores

5.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
5.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

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-670Always-Incorrect Control Flow Implementation
CWE-303Incorrect Implementation of Authentication Algorithm
CWE-480Use of Incorrect Operator
T1190Exploit Public-Facing Application

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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