CVE-2022-34009Public exploitNetwork attack vector

Daemon crash via Defender-removed ticket temporary file

Published Jul 27, 2022 · Updated Aug 3, 2024

Denial of service in Fossil 2.18 on Windows allows remote attackers to crash the daemon by submitting a malicious anonymous ticket. Fossil writes untrusted ticket content to a fossil_server_* temporary file, then fails to handle the file's removal by Defender and repeatedly retries until the process crashes. Exploitation requires Windows Defender to quarantine the temporary file and anonymous ticket creation to be enabled, leaving the Fossil service inaccessible.

CVSS severity5.5
Medium
EPSS probability0.36%
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 Fossil 2.18 on Windows allows remote attackers to crash the daemon by submitting a malicious anonymous ticket. Fossil writes untrusted ticket content to a fossil_server_* temporary file, then fails to handle the file's removal by Defender and repeatedly retries until the process crashes. Exploitation requires Windows Defender to quarantine the temporary file and anonymous ticket creation to be enabled, leaving the Fossil service inaccessible.

The record

CVE
CVE-2022-34009
Published
Jul 27, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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