CVE-2021-3678: showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Q: How do I fix CVE-2021-3678?

showdoc: upgrade to 2.9.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-3678 being exploited?

CVE-2021-3678 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-2021-3678 affect?

CVE-2021-3678 affects showdoc. Severity is medium (CVSS 5.9). showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Q: How urgent is CVE-2021-3678?

Priority 42/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.9REMOTEUPGRADE

CVE-2021-3678 is a medium-severity flaw (CVSS 5.9) affecting showdoc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-338
Published	2021-08-04
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: showdoc

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

Am I affected?

Timeline

2021-08-04 14:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

showdoc showdoc UPGRADE

Affected: < 2.9.8

Fixed in: 2.9.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy showdoc || rpm -q showdoc || showdoc --version

2. UPGRADE to 2.9.8 (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.

Quick answers

How do I fix CVE-2021-3678?

showdoc: upgrade to 2.9.8. Exact commands for each OS are on this page.

Is CVE-2021-3678 being exploited?

CVE-2021-3678 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-2021-3678 affect?

CVE-2021-3678 affects showdoc. Severity is medium (CVSS 5.9). showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

How urgent is CVE-2021-3678?

Priority 42/100. Remotely exploitable, no login, no user action

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.

References

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