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CRITICAL severity

CVE-2021-45331 — gitea

CRITICALFix: go-gitea/gitea#3878

CVE-2021-45331 is a critical-severity (CVSS 9.8) Improper Authentication vulnerability in code.gitea.io/gitea. A fix is available for code.gitea.io/gitea — see the affected versions and patch details below.

Reuse of one time passwords allowed in Gitea

Also known asBIT-gitea-2021-45331GHSA-hfmf-q69j-6m5pGO-2022-0315
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.65%1.29%1.93%0.2%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-45331 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹code.gitea.io/gitea

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.

Description

An Authentication Bypass vulnerability exists in Gitea before 1.5.0, which could let a malicious user gain privileges. If captured, the TOTP code for the 2FA can be submitted correctly more than once.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gocode.gitea.io/giteaall versions1.5.0go get code.gitea.io/gitea@v1.5.0

Affected Products

1 product · 1 configurations
Application
giteagitea
< 1.5.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for code.gitea.io/gitea, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update code.gitea.io/gitea to 1.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45331 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

An Authentication Bypass vulnerability exists in Gitea before 1.5.0, which could let a malicious user gain privileges. If captured, the TOTP code for the 2FA can be submitted correctly more than once.
O3 Security · Impact-Aware SCA

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CVE-2021-45331: gitea Auth Bypass — Fixed in 1.5.0