CVE-2012-0785: Hash collision attack vulnerability in Jenkins before 1.447, Jenkins LTS before 1.424.2, and Jenkins Enterpris

Q: How do I fix CVE-2012-0785?

jenkins: upgrade to 1.400.0.11, 1.424.2.1; jenkins: upgrade to 1.424.2, 1.447. Exact commands for each OS are on this page.

Q: Is CVE-2012-0785 being exploited?

CVE-2012-0785 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-0785 affect?

CVE-2012-0785 affects jenkins, jenkins. Severity is high (CVSS 7.5). Hash collision attack vulnerability in Jenkins before 1.447, Jenkins LTS before 1.424.2, and Jenkins Enterprise by CloudBees 1.424.x before 1.424.2.1 and 1.400.x before 1.400.0.11 could allow remote attackers to cause a considerable CPU loa

Q: How urgent is CVE-2012-0785?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2012-0785 is a high-severity flaw (CVSS 7.5) affecting jenkins, jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hash collision attack vulnerability in Jenkins before 1.447, Jenkins LTS before 1.424.2, and Jenkins Enterprise by CloudBees 1.424.x before 1.424.2.1 and 1.400.x before 1.400.0.11 could allow remote attackers to cause a considerable CPU load, aka "the Hash DoS attack."

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-400
Published	2020-02-24
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: cloudbees · jenkins

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-02-24 17:15 UTCPublished CVE record published
2026-06-16 23:38 UTCUpdated Record last modified

cloudbees jenkins UPGRADE

Affected: >= 1.400.0 and < 1.400.0.11 · >= 1.424.0 and < 1.424.2.1

Fixed in: 1.400.0.11, 1.424.2.1

Safe to downgrade to: a release before 1.400.0

1. Check installed version

apt-cache policy jenkins || rpm -q jenkins || jenkins --version

2. UPGRADE to 1.400.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jenkins

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jenkins

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.400.0 (Debian / Ubuntu)

apt-cache madison jenkins sudo apt install jenkins=<VERSION_BEFORE_1.400.0> sudo apt-mark hold jenkins

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jenkins sudo dnf downgrade jenkins-<VERSION_BEFORE_1.400.0> sudo dnf versionlock add jenkins

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

jenkins jenkins UPGRADE

Affected: < 1.424.2 · < 1.447

Fixed in: 1.424.2, 1.447

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jenkins || rpm -q jenkins || jenkins --version

2. UPGRADE to 1.424.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jenkins

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jenkins

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-0785?

jenkins: upgrade to 1.400.0.11, 1.424.2.1; jenkins: upgrade to 1.424.2, 1.447. Exact commands for each OS are on this page.

Is CVE-2012-0785 being exploited?

CVE-2012-0785 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-0785 affect?

CVE-2012-0785 affects jenkins, jenkins. Severity is high (CVSS 7.5). Hash collision attack vulnerability in Jenkins before 1.447, Jenkins LTS before 1.424.2, and Jenkins Enterprise by CloudBees 1.424.x before 1.424.2.1 and 1.400.x before 1.400.0.11 could allow remote attackers to cause a considerable CPU loa

How urgent is CVE-2012-0785?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Software pages

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References

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