CVE-2021-3028: git-big-picture before 1.0.0 mishandles ' characters in a branch name, leading to code execution.

Q: How do I fix CVE-2021-3028?

git-big-picture: upgrade to 1.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-3028 being exploited?

CVE-2021-3028 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-2021-3028 affect?

CVE-2021-3028 affects git-big-picture. Severity is critical (CVSS 9.8). git-big-picture before 1.0.0 mishandles ' characters in a branch name, leading to code execution.

Q: How urgent is CVE-2021-3028?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-3028 is a critical-severity flaw (CVSS 9.8) affecting git-big-picture. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

git-big-picture before 1.0.0 mishandles ' characters in a branch name, leading to code execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-01-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: git-big-picture project

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

Am I affected?

Timeline

2021-01-13 17:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

git-big-picture project git-big-picture UPGRADE

Affected: < 1.0.0

Fixed in: 1.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy git-big-picture || rpm -q git-big-picture || git-big-picture --version

2. UPGRADE to 1.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade git-big-picture

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade git-big-picture

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-2021-3028?

git-big-picture: upgrade to 1.0.0. Exact commands for each OS are on this page.

Is CVE-2021-3028 being exploited?

CVE-2021-3028 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-2021-3028 affect?

CVE-2021-3028 affects git-big-picture. Severity is critical (CVSS 9.8). git-big-picture before 1.0.0 mishandles ' characters in a branch name, leading to code execution.

How urgent is CVE-2021-3028?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Git vulnerabilities

References

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