Vulnerability Details CVE-2025-69418
Issue summary: When using the low-level OCB API directly with AES-NI or<br>other hardware-accelerated code paths, inputs whose length is not a multiple<br>of 16 bytes can leave the final partial block unencrypted and unauthenticated.<br><br>Impact summary: The trailing 1-15 bytes of a message may be exposed in<br>cleartext on encryption and are not covered by the authentication tag,<br>allowing an attacker to read or tamper with those bytes without detection.<br><br>The low-level OCB encrypt and decrypt routines in the hardware-accelerated<br>stream path process full 16-byte blocks but do not advance the input/output<br>pointers. The subsequent tail-handling code then operates on the original<br>base pointers, effectively reprocessing the beginning of the buffer while<br>leaving the actual trailing bytes unprocessed. The authentication checksum<br>also excludes the true tail bytes.<br><br>However, typical OpenSSL consumers using EVP are not affected because the<br>higher-level EVP and provider OCB implementations split inputs so that full<br>blocks and trailing partial blocks are processed in separate calls, avoiding<br>the problematic code path. Additionally, TLS does not use OCB ciphersuites.<br>The vulnerability only affects applications that call the low-level<br>CRYPTO_ocb128_encrypt() or CRYPTO_ocb128_decrypt() functions directly with<br>non-block-aligned lengths in a single call on hardware-accelerated builds.<br>For these reasons the issue was assessed as Low severity.<br><br>The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected<br>by this issue, as OCB mode is not a FIPS-approved algorithm.<br><br>OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.<br><br>OpenSSL 1.0.2 is not affected by this issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.2%
CVSS Severity
CVSS v3 Score 4.0
References
- https://github.com/openssl/openssl/commit/372fc5c77529695b05b4f5b5187691a57ef5dffc
- https://github.com/openssl/openssl/commit/4016975d4469cd6b94927c607f7c511385f928d8
- https://github.com/openssl/openssl/commit/52d23c86a54adab5ee9f80e48b242b52c4cc2347
- https://github.com/openssl/openssl/commit/a7589230356d908c0eca4b969ec4f62106f4f5ae
- https://github.com/openssl/openssl/commit/ed40856d7d4ba6cb42779b6770666a65f19cb977
- https://openssl-library.org/news/secadv/20260127.txt
Products affected by CVE-2025-69418
-
cpe:2.3:a:openssl:openssl:*
-
cpe:2.3:a:openssl:openssl:1.1.1
-
cpe:2.3:a:openssl:openssl:1.1.1a
-
cpe:2.3:a:openssl:openssl:1.1.1b
-
cpe:2.3:a:openssl:openssl:1.1.1c
-
cpe:2.3:a:openssl:openssl:1.1.1d
-
cpe:2.3:a:openssl:openssl:1.1.1e
-
cpe:2.3:a:openssl:openssl:1.1.1f
-
cpe:2.3:a:openssl:openssl:1.1.1g
-
cpe:2.3:a:openssl:openssl:1.1.1h
-
cpe:2.3:a:openssl:openssl:1.1.1i
-
cpe:2.3:a:openssl:openssl:1.1.1j
-
cpe:2.3:a:openssl:openssl:1.1.1k
-
cpe:2.3:a:openssl:openssl:1.1.1l
-
cpe:2.3:a:openssl:openssl:1.1.1m
-
cpe:2.3:a:openssl:openssl:1.1.1n
-
cpe:2.3:a:openssl:openssl:1.1.1o
-
cpe:2.3:a:openssl:openssl:1.1.1p
-
cpe:2.3:a:openssl:openssl:1.1.1q
-
cpe:2.3:a:openssl:openssl:1.1.1r
-
cpe:2.3:a:openssl:openssl:1.1.1s
-
cpe:2.3:a:openssl:openssl:1.1.1t
-
cpe:2.3:a:openssl:openssl:1.1.1u
-
cpe:2.3:a:openssl:openssl:1.1.1v
-
cpe:2.3:a:openssl:openssl:1.1.1w
-
cpe:2.3:a:openssl:openssl:1.1.1x
-
cpe:2.3:a:openssl:openssl:3.0.0
-
cpe:2.3:a:openssl:openssl:3.0.1
-
cpe:2.3:a:openssl:openssl:3.0.10
-
cpe:2.3:a:openssl:openssl:3.0.11
-
cpe:2.3:a:openssl:openssl:3.0.12
-
cpe:2.3:a:openssl:openssl:3.0.13
-
cpe:2.3:a:openssl:openssl:3.0.14
-
cpe:2.3:a:openssl:openssl:3.0.15
-
cpe:2.3:a:openssl:openssl:3.0.2
-
cpe:2.3:a:openssl:openssl:3.0.3
-
cpe:2.3:a:openssl:openssl:3.0.4
-
cpe:2.3:a:openssl:openssl:3.0.5
-
cpe:2.3:a:openssl:openssl:3.0.6
-
cpe:2.3:a:openssl:openssl:3.0.7
-
cpe:2.3:a:openssl:openssl:3.0.8
-
cpe:2.3:a:openssl:openssl:3.0.9
-
cpe:2.3:a:openssl:openssl:3.3.0
-
cpe:2.3:a:openssl:openssl:3.3.1
-
cpe:2.3:a:openssl:openssl:3.3.2