CVE-2017-12972: In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct...

Description

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

Metrics

EPSS Probability

0.89%

54.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-345

Affected Software

Vendor	Product	Versions
Connect2id	Nimbus Jose\+Jwt	1.0
Connect2id	Nimbus Jose\+Jwt	1.1
Connect2id	Nimbus Jose\+Jwt	1.2
Connect2id	Nimbus Jose\+Jwt	1.3
Connect2id	Nimbus Jose\+Jwt	1.4
Connect2id	Nimbus Jose\+Jwt	1.5
Connect2id	Nimbus Jose\+Jwt	1.6
Connect2id	Nimbus Jose\+Jwt	1.7
Connect2id	Nimbus Jose\+Jwt	1.8
Connect2id	Nimbus Jose\+Jwt	1.9
Connect2id	Nimbus Jose\+Jwt	1.9.1
Connect2id	Nimbus Jose\+Jwt	1.10
Connect2id	Nimbus Jose\+Jwt	1.11
Connect2id	Nimbus Jose\+Jwt	1.12
Connect2id	Nimbus Jose\+Jwt	2.0
Connect2id	Nimbus Jose\+Jwt	2.0.1
Connect2id	Nimbus Jose\+Jwt	2.1
Connect2id	Nimbus Jose\+Jwt	2.1.1
Connect2id	Nimbus Jose\+Jwt	2.2
Connect2id	Nimbus Jose\+Jwt	2.3
Connect2id	Nimbus Jose\+Jwt	2.4
Connect2id	Nimbus Jose\+Jwt	2.5
Connect2id	Nimbus Jose\+Jwt	2.6
Connect2id	Nimbus Jose\+Jwt	2.7
Connect2id	Nimbus Jose\+Jwt	2.8
Connect2id	Nimbus Jose\+Jwt	2.9
Connect2id	Nimbus Jose\+Jwt	2.10
Connect2id	Nimbus Jose\+Jwt	2.10.1
Connect2id	Nimbus Jose\+Jwt	2.11.0
Connect2id	Nimbus Jose\+Jwt	2.12.0
Connect2id	Nimbus Jose\+Jwt	2.13.0
Connect2id	Nimbus Jose\+Jwt	2.13.1
Connect2id	Nimbus Jose\+Jwt	2.14
Connect2id	Nimbus Jose\+Jwt	2.15
Connect2id	Nimbus Jose\+Jwt	2.15.1
Connect2id	Nimbus Jose\+Jwt	2.15.2
Connect2id	Nimbus Jose\+Jwt	2.16
Connect2id	Nimbus Jose\+Jwt	2.17
Connect2id	Nimbus Jose\+Jwt	2.17.1
Connect2id	Nimbus Jose\+Jwt	2.17.2
Connect2id	Nimbus Jose\+Jwt	2.18
Connect2id	Nimbus Jose\+Jwt	2.18.1
Connect2id	Nimbus Jose\+Jwt	2.18.2
Connect2id	Nimbus Jose\+Jwt	2.19
Connect2id	Nimbus Jose\+Jwt	2.19.1
Connect2id	Nimbus Jose\+Jwt	2.20
Connect2id	Nimbus Jose\+Jwt	2.21
Connect2id	Nimbus Jose\+Jwt	2.22
Connect2id	Nimbus Jose\+Jwt	2.22.1
Connect2id	Nimbus Jose\+Jwt	2.23

Showing 50 of 127 affected configurations. See NVD for the full list.

References

https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86cThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbcPatch, Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txtRelease Notes, Third Party Advisory
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86cThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbcPatch, Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txtRelease Notes, Third Party Advisory
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E

Timeline

Published: Aug 20, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-12972?

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

How severe is CVE-2017-12972?

Severity scoring for CVE-2017-12972 is pending analysis. The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2017-12972?

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.

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