HOMEVULNERABILITIESCVE-2017-12972
HIGH

CVE-2017-12972

CWE-345Published: August 20, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2017-12972 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

connect2id1 product(s)
nimbus jose\+jwt
Source: NVD CPE · 127 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc
PATCHhttps://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc
ADVISORYhttps://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86c
ADVISORYhttps://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt
ADVISORYhttps://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86c
ADVISORYhttps://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt

All References (8)

→
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

Quick Facts

CVE IDCVE-2017-12972
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-345
CISA KEVNo
Affected1 vendor(s)
PublishedAug 20, 2017

Related CVEs (CWE-345)

CVE-2026-45674
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CVE-2022-3703
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CVE-2014-8165
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CVE-2026-35051
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CVE-2026-47691
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CVE-2026-50195
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-12972 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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