CVE-2021-21237 json
Git LFS can execute a Git binary from the current directory on Windows
published 2021-01-15 5 y ago modified 2026-09-08 2 mo ago also BIT-git-lfs-2021-21237 , EUVD-2022-0965 , GHSA-cx3w-xqmc-84g5 , GO-2021-0098
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
Git LFS is a command line extension for managing large files with Git. On Windows, if Git LFS operates on a malicious repository with a git.bat or git.exe file in the current directory, that program would be executed, permitting the attacker to execute arbitrary code. This does not affect Unix systems. This is the result of an incomplete fix for CVE-2020-27955. This issue occurs because on Windows, Go includes (and prefers) the current directory when the name of a command run does not contain a directory separator. Other than avoiding untrusted repositories or using a different operating system, there is no workaround. This is fixed in v2.13.2.
Patch / fix
- go github.com/git-lfs/git-lfs 1.5.1-0.20210113180018-fc664697ed2c, 2.13.2
- bitnami git-lfs 2.13.2
- git_large_file_storage_project git_large_file_storage 2.13.2
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
| GitHub | 3.1 | 7.2 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
| OSV | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/git-lfs/git-lfs | <2.13.2 <1.5.1-0.20210113180018-fc664697ed2c |
2.13.2 1.5.1-0.20210113180018-fc664697ed2c |
| bitnami | git-lfs | <2.13.2 |
2.13.2 |
Affected products
- git-lfs git-lfs
Classification
References
-
github.com
/git-lfs/git-lfs/commit/fc664697ed2c2081ee9633010de0a7f9debea72a
web, patch, third-party-advisory, advisory
-
github.com
/git-lfs/git-lfs/security/advisories/GHSA-cx3w-xqmc-84g5
web, third-party-advisory, advisory
-
cve.mitre.org
/cgi-bin/cvename.cgi?name=CVE-2020-27955
web, third-party-advisory, advisory
-
github.com
/git-lfs/git-lfs/releases/tag/v2.13.2
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-21237
advisory, web
-
github.com
/git-lfs/git-lfs
package
-
pkg.go.dev
/vuln/GO-2021-0098
web
Sources
- CVE List CVE-2021-21237
- GitHub Advisory GHSA-cx3w-xqmc-84g5
- NVD CVE-2021-21237
- OSV BIT-git-lfs-2021-21237
- OSV GO-2021-0098
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.