CVE-2023-37464

Status: ModifiedHigh (7.5)—

OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC).

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Base score: 7.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.71%
Percentile among all scored CVEs: 52
Score date: 10/7/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Cisco — Cjose

CWEs

CWE-327

References

Raw JSON (NVD)

Show

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      "value": "OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec  says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC)."
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      "value": "OpenIDC/cjose es una biblioteca C que implementa Javascript Object Signing and Encryption (JOSE). La rutina de descifrado AES GCM utiliza incorrectamente la longitud de la etiqueta de la etiqueta de autenticación real proporcionada en el JWE. La especificación dice que se debe aplicar una longitud fija de 16 octetos. Por lo tanto, este error permite a un atacante proporcionar una etiqueta de autenticación truncada y modificar el JWE en consecuencia. Los usuarios deben actualizar a una versión &gt;= 0.6.2.2. Los usuarios que no puedan actualizar deben evitar el uso del cifrado AES GCM y reemplazarlo con otro algoritmo de cifrado (por ejemplo, AES CBC)."
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