CVE-2017-12972
high-risk
Published 2017-08-20
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.
Do I need to act?
-
0.15% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (20)
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Nimbus Jose\+Jwt
Affected Vendors
References (8)
Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4fa...
Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4fa...
59
/ 100
high-risk
Severity
26/34 · High
Exploitability
1/34 · Minimal
Exposure
32/34 · Critical