CVE-2017-18239

Name: CVE-2017-18239
Creator: NVD / NIST
Published: 2018-03-18T03:29:00.213+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.03%

Last modified Jun 17, 2026

CVE-2017-18239 is a vulnerability of currently unknown severity. A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.. EPSS estimates a 2.03% chance of exploitation in the next 30 days.

Description

A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.

Metrics

EPSS Probability

2.03%

78.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Authentikat-Jwt Project	Authentikat-Jwt	<= 0.4.5

References

https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0Patch, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/issues/12Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/pull/36Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0Patch, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/issues/12Issue Tracking, Third Party Advisory
https://github.com/jasongoodwin/authentikat-jwt/pull/36Issue Tracking, Third Party Advisory

Timeline

Published: Mar 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-18239?

How severe is CVE-2017-18239?

Severity scoring for CVE-2017-18239 is pending analysis. The EPSS model estimates a 2.03% probability of exploitation in the next 30 days.

How do I fix CVE-2017-18239?

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-2017-18239?

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

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Source: NVD / NIST