CVE-2020-27955: Git LFS 2.12.0 allows Remote Code Execution.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-27955 is a critical-severity flaw (CVSS 9.8) affecting git large file storage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Git LFS 2.12.0 allows Remote Code Execution.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
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	82.3% (top 1%)
CISA exploited list	No
Weakness	CWE-427
Published	2020-11-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: git large file storage project

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

Am I affected?

Timeline

2020-11-05 15:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

git large file storage project git large file storage DOWNGRADE

Affected: 2.12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.12.0

1. Check installed version

apt-cache policy git-large-file-storage || rpm -q git-large-file-storage || git-large-file-storage --version

2. No fixed release: DOWNGRADE to a release before 2.12.0 (Debian / Ubuntu)

apt-cache madison git-large-file-storage sudo apt install git-large-file-storage=<VERSION_BEFORE_2.12.0> sudo apt-mark hold git-large-file-storage

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

dnf --showduplicates list git-large-file-storage sudo dnf downgrade git-large-file-storage-<VERSION_BEFORE_2.12.0> sudo dnf versionlock add git-large-file-storage

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Git Remote Code Execution via git-lfs (CVE-2020-27955)

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-2020-27955?

git large file storage: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27955 being exploited?

CVE-2020-27955 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-2020-27955 affect?

CVE-2020-27955 affects git large file storage. Severity is critical (CVSS 9.8). Git LFS 2.12.0 allows Remote Code Execution.

How urgent is CVE-2020-27955?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Git vulnerabilities

Related CVEs

CVE-2022-24826 CRITICAL 9.8 UPGRADE On Windows, if Git LFS operates on a malicious repository with a `..exe` file as well as a file named `git.exe
CVE-2021-21237 HIGH 7.2 UPGRADE Git LFS is a command line extension for managing large files with Git

References

← Back to latest CVEs