OpenSSL up to 3.6.0 Low-level OCB API levelCRYPTO_ocb128_encrypt missing cryptographic step

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.66

Summaryinfo

A vulnerability described as problematic has been identified in OpenSSL up to 3.6.0. This affects the function levelCRYPTO_ocb128_encrypt of the component Low-level OCB API. The manipulation results in missing cryptographic step. This vulnerability is identified as CVE-2025-69418. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in OpenSSL up to 3.6.0. Affected is the function levelCRYPTO_ocb128_encrypt of the component Low-level OCB API. The manipulation with an unknown input leads to a missing cryptographic step vulnerability. CWE is classifying the issue as CWE-325. The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at openssl-library.org. This vulnerability is traded as CVE-2025-69418 since 01/06/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/09/2026). This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 296779 (Linux Distros Unpatched Vulnerability : CVE-2025-69418), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.1.1ze, 3.0.19, 3.3.6, 3.4.4, 3.5.5 or 3.6.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (296779) and CERT Bund (WID-SEC-2026-0234). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • IBM VIOS
  • IBM AIX
  • Debian Linux
  • Google Cloud Platform
  • IBM DataPower Gateway
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • NetApp Data ONTAP
  • Siemens SIMATIC WinCC
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IGEL OS
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Fabasoft Cloud
  • RESF Rocky Linux
  • IBM App Connect Enterprise
  • Dell BIOS
  • Dell PowerScale OneFS
  • Siemens SIMATIC STEP 7
  • Open Source OpenSSL
  • Broadcom Brocade SANnav
  • Fortinet FortiPortal
  • Meinberg LANTIME
  • Red Hat OpenShift
  • IBM MQ
  • Open Source Camunda
  • ABB AC-500
  • Dell Secure Connect Gateway
  • IBM InfoSphere Information Server
  • Splunk Splunk Enterprise
  • Phoenix Contact FL MGUARD
  • Phoenix Contact FL SWITCH
  • Phoenix Contact TC ROUTER
  • Dell integrated Dell Remote Access Controller
  • Siemens SIMATIC S7
  • Insyde UEFI Firmware
  • NCP Secure Enterprise VPN Server

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing cryptographic step
CWE: CWE-325
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 296779
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-69418

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenSSL 1.1.1ze/3.0.19/3.3.6/3.4.4/3.5.5/3.6.1

Timelineinfo

01/06/2026 CVE reserved
01/27/2026 +21 days Advisory disclosed
01/27/2026 +0 days VulDB entry created
06/09/2026 +133 days VulDB entry last update

Sourcesinfo

Product: openssl.org

Advisory: openssl-library.org
Status: Confirmed

CVE: CVE-2025-69418 (🔒)
GCVE (CVE): GCVE-0-2025-69418
GCVE (VulDB): GCVE-100-343026
CERT Bund: WID-SEC-2026-0234 - OpenSSL: Mehrere Schwachstellen

Entryinfo

Created: 01/27/2026 17:17
Updated: 06/09/2026 13:19
Changes: 01/27/2026 17:17 (55), 01/28/2026 02:06 (2), 01/28/2026 15:43 (1), 01/28/2026 19:36 (7), 01/29/2026 13:29 (1), 03/05/2026 21:53 (1), 03/13/2026 16:20 (1), 06/09/2026 13:19 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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