CVE-2021-29451

Name: CVE-2021-29451
Creator: NVD / NIST
Published: 2021-04-16T22:15:14.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-29451 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.95%

56.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Manydesigns	Portofino	>= 5.0.0, < 5.2.1

References

https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fbPatch, Third Party Advisory
https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6xThird Party Advisory
https://mvnrepository.com/artifact/com.manydesigns/portofinoThird Party Advisory
https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fbPatch, Third Party Advisory
https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6xThird Party Advisory
https://mvnrepository.com/artifact/com.manydesigns/portofinoThird Party Advisory

Timeline

Published: Apr 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29451?

How severe is CVE-2021-29451?

CVE-2021-29451 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29451?

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.

Are you affected by CVE-2021-29451?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST