CVE-2022-40617Network attack vector

Service interruption via untrusted revocation URLs

Published Oct 31, 2022 · Updated May 6, 2025

Denial of service in strongSwan before 5.9.8 allows remote attackers to interrupt the IKE daemon through crafted certificates. The credential manager performs inline OCSP and CRL lookups from certificate-provided URLs before the chain is trusted, and fetched response data has no size limit. Exploitation requires the revocation plugin or a similar custom validator; repeated IKE initiations can block all worker threads, while oversized responses can exhaust memory and terminate the daemon.

CVSS severity7.5
High
EPSS probability1.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in strongSwan before 5.9.8 allows remote attackers to interrupt the IKE daemon through crafted certificates. The credential manager performs inline OCSP and CRL lookups from certificate-provided URLs before the chain is trusted, and fetched response data has no size limit. Exploitation requires the revocation plugin or a similar custom validator; repeated IKE initiations can block all worker threads, while oversized responses can exhaust memory and terminate the daemon.

The record

CVE
CVE-2022-40617
Published
Oct 31, 2022
Updated
May 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2022CVE publishedPublication date reported by the CVE source.
  2. May 6, 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?

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

7.5CISA-ADPCVSS: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
T1499.003Application Exhaustion Flood

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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