How severe is CVE-2020-27955?

CVE-2020-27955 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2020-27955?

CVE-2020-27955 affects the following packages: github.com/git-lfs/git-lfs (Go). Ecosystems affected: Go.

How do I fix CVE-2020-27955?

Update github.com/git-lfs/git-lfs to version 2.12.1 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2020-27955 actively exploited in the wild?

Yes. There are 12 known exploit references for CVE-2020-27955, including 9 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2020-27955?

CVE-2020-27955 has an EPSS (Exploit Prediction Scoring System) score of 92.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2020-27955 published, and has it been updated?

CVE-2020-27955 was published on November 5, 2020 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

CVE-2020-27955

CRITICAL

Git LFS can execute a Git binary from the current directory

Also known asBIT-git-lfs-2020-27955GHSA-4g4p-42wc-9f3m

Published

Nov 5, 2020

Updated

Apr 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

12 known

EPSS Exploitation Probability

via FIRST.org ↗

92.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐹github.com/git-lfs/git-lfs

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.