PatchTheCVECVE-2021-3775: showdoc is vulnerable to Cross-Site Request Forgery (CSRF)
33
Routine
MEDIUM 5.4UPGRADE
CVE-2021-3775 is a medium-severity flaw (CVSS 5.4) affecting showdoc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
showdoc is vulnerable to Cross-Site Request Forgery (CSRF)
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.4% (top 64%) |
| CISA exploited list | No |
| Weakness | CWE-352 |
| Published | 2021-11-13 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
showdoc showdoc UPGRADE
Affected: <= 2.9.12
Fixed in: newer than 2.9.12
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy showdoc || rpm -q showdoc || showdoc --version
2. UPGRADE to newer than 2.9.12 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade showdoc
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade showdoc
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.
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-2021-3775?
showdoc: upgrade to newer than 2.9.12. Exact commands for each OS are on this page.
Is CVE-2021-3775 being exploited?
CVE-2021-3775 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-2021-3775 affect?
CVE-2021-3775 affects showdoc. Severity is medium (CVSS 5.4). showdoc is vulnerable to Cross-Site Request Forgery (CSRF)
How urgent is CVE-2021-3775?
Priority 33/100. Public exploit reference
Related CVEs
- CVE-2022-1034 HIGH 7.2 UPGRADE There is a Unrestricted Upload of File vulnerability in ShowDoc v2.10.3 in GitHub repository star7th/showdoc p
- CVE-2022-0967 MEDIUM 5.4 UPGRADE Stored XSS via File Upload in star7th/showdoc in star7th/showdoc in GitHub repository star7th/showdoc prior to
- CVE-2022-0966 MEDIUM 5.4 UPGRADE Stored XSS via File Upload in star7th/showdoc in GitHub repository star7th/showdoc prior to 2.4.10.
- CVE-2022-0965 MEDIUM 5.4 UPGRADE Stored XSS viva .ofd file upload in GitHub repository star7th/showdoc prior to 2.10.4.
- CVE-2022-0964 MEDIUM 5.4 UPGRADE Stored XSS viva .webmv file upload in GitHub repository star7th/showdoc prior to 2.10.4.