CVE-2022-26498Network attack vector

Service interruption via unchecked STIR/SHAKEN certificate downloads

Published Apr 15, 2022 · Updated Aug 3, 2024

Resource exhaustion in Asterisk 16.15.0 through 16.25.1, before 18.11.2, and before 19.3.2 allows remote attackers to interrupt service. When STIR/SHAKEN is enabled, res_stir_shaken follows the certificate URL in an inbound SIP Identity header without rejecting noncertificates or limiting download size. Remote attackers need no authentication, but STIR/SHAKEN verification must be enabled; oversized transfers exhaust resources and interrupt service.

CVSS severity7.5
High
EPSS probability16.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Asterisk 16.15.0 through 16.25.1, before 18.11.2, and before 19.3.2 allows remote attackers to interrupt service. When STIR/SHAKEN is enabled, res_stir_shaken follows the certificate URL in an inbound SIP Identity header without rejecting noncertificates or limiting download size. Remote attackers need no authentication, but STIR/SHAKEN verification must be enabled; oversized transfers exhaust resources and interrupt service.

The record

CVE
CVE-2022-26498
Published
Apr 15, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5OSVCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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