CVE-2012-0785Network attack vector

Service interruption via colliding HTTP parameter keys

Published Feb 24, 2020 · Updated Aug 6, 2024

Hash-collision denial of service in Jenkins before 1.447 and LTS before 1.424.2 allows remote attackers to interrupt service via crafted HTTP data. Winstone processes attacker-controlled request keys in hash tables whose predictable collisions force excessive CPU work when parameter counts are not sufficiently limited. Unauthenticated network access to a Winstone-backed instance is sufficient; the resulting CPU exhaustion denies legitimate requests without disclosing data.

CVSS severity7.5
High
EPSS probability3.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hash-collision denial of service in Jenkins before 1.447 and LTS before 1.424.2 allows remote attackers to interrupt service via crafted HTTP data. Winstone processes attacker-controlled request keys in hash tables whose predictable collisions force excessive CPU work when parameter counts are not sufficiently limited. Unauthenticated network access to a Winstone-backed instance is sufficient; the resulting CPU exhaustion denies legitimate requests without disclosing data.

The record

CVE
CVE-2012-0785
Published
Feb 24, 2020
Updated
Aug 6, 2024
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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?

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

  1. Affected versionversion=before 1.424.2
  2. Affected versionversion=before 1.447

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Jenkinsversion=before 1.424.2; version=before 1.447

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS: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.

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 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.

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Technologies

Your stack

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Your stack

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