CVE-2021-3831
MEDIUMCVSS 6.1/10EPSS 1.81%
Last modified
CVE-2021-3831 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. gnuboard5 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). EPSS estimates a 1.81% chance of exploitation in the next 30 days.
Description
gnuboard5 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gnuboard | Gnuboard5 | < 5.4.20 |
References
- https://github.com/gnuboard/gnuboard5/commit/2e81619ea87bc9c0b4a073d8df3c7693a6fdbf0dPatch, Third Party Advisory
- https://huntr.dev/bounties/25775287-88cd-4f00-b978-692d627dff04Exploit, Patch, Third Party Advisory
- https://github.com/gnuboard/gnuboard5/commit/2e81619ea87bc9c0b4a073d8df3c7693a6fdbf0dPatch, Third Party Advisory
- https://huntr.dev/bounties/25775287-88cd-4f00-b978-692d627dff04Exploit, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3831?
gnuboard5 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
How severe is CVE-2021-3831?
CVE-2021-3831 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.81% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3831?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3831?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST