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Fencer Intel
critical 9.1

CVE-2021-29451 json

Missing validation of JWT signature in `ManyDesigns/Portofino`

published 5y ago modified 4mo ago also GHSA-6g3c-2mh5-7q6x , EUVD-2021-0773

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven com.manydesigns:portofino-dispatcher 5.2.1
  • maven com.manydesigns:portofino-core 5.2.1
  • manydesigns portofino 5.2.1

Is CVE-2021-29451 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven com.manydesigns:portofino-dispatcher
>=5.0.0, <5.2.1
5.2.1
maven com.manydesigns:portofino-core
>=5.0.0, <5.2.1
5.2.1

Affected products

  • ManyDesigns Portofino

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.