CVE-2020-35458: An issue was discovered in ClusterLabs Hawk 2.x through 2.3.0-x

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-35458 is a critical-severity flaw (CVSS 9.8) affecting hawk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in ClusterLabs Hawk 2.x through 2.3.0-x. There is a Ruby shell code injection issue via the hawk_remember_me_id parameter in the login_from_cookie cookie. The user logout routine could be used by unauthenticated remote attackers to execute code as hauser.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Weakness	CWE-78
Published	2021-01-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: clusterlabs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-01-12 15:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

clusterlabs hawk DOWNGRADE

Affected: 2.2.0-12 · 2.3.0-12

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0-12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.2.0-12 (Debian / Ubuntu)

apt-cache madison hawk sudo apt install hawk=<VERSION_BEFORE_2.2.0-12> sudo apt-mark hold hawk

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hawk sudo dnf downgrade hawk-<VERSION_BEFORE_2.2.0-12> sudo dnf versionlock add hawk

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.

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-2020-35458?

hawk: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35458 being exploited?

CVE-2020-35458 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-2020-35458 affect?

CVE-2020-35458 affects hawk. Severity is critical (CVSS 9.8). An issue was discovered in ClusterLabs Hawk 2.x through 2.3.0-x. There is a Ruby shell code injection issue via the hawk_remember_me_id parameter in the login_from_cookie cookie. The user logout routine could be used by unauthenticated remo

How urgent is CVE-2020-35458?

Priority 63/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

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References

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