CVE-2025-36084: IBM Concert Weak Cryptography Vulnerability

CVE-2025-36084 Overview

CVE-2025-36084 affects IBM Concert versions 1.0.0 through 3.0.0. The product uses weaker than expected cryptographic algorithms to protect sensitive data. An attacker with sufficient access to encrypted material could decrypt highly sensitive information. The weakness is categorized under [CWE-327] Use of a Broken or Risky Cryptographic Algorithm. The vulnerability requires network access and no authentication, but exploitation carries high attack complexity. Only confidentiality is impacted; integrity and availability are unaffected.

Critical Impact
An attacker who can obtain encrypted data protected by IBM Concert may recover plaintext containing sensitive information, undermining the confidentiality guarantees the product is expected to provide.

Affected Products

IBM Concert 1.0.0
IBM Concert 2.x
IBM Concert 3.0.0

Discovery Timeline

2026-09-22 - CVE-2025-36084 published to the National Vulnerability Database
2026-09-23 - Last updated in NVD database

Technical Details for CVE-2025-36084

Vulnerability Analysis

IBM Concert relies on cryptographic algorithms that do not meet current strength expectations for protecting sensitive information. When the product encrypts data using these weaker primitives, an attacker who observes or obtains the resulting ciphertext can attempt cryptanalytic recovery of the plaintext. The scope is limited to confidentiality because the flaw resides in the encryption strength, not in authentication, integrity, or availability controls. The high attack complexity reflects the effort and conditions required to perform successful decryption against the weakened algorithm.

Root Cause

The root cause is the selection of cryptographic algorithms, modes, or key sizes that are no longer considered sufficient to resist modern cryptanalysis, tracked as [CWE-327]. Weak primitives include deprecated hash functions, short symmetric keys, or block ciphers used in vulnerable modes. IBM has not published the specific algorithm or configuration in the public advisory, but the effect is that ciphertext produced by IBM Concert 1.0.0 through 3.0.0 offers reduced protection compared to industry expectations.

Attack Vector

Exploitation requires network-adjacent access to encrypted material generated or transmitted by IBM Concert. An attacker who intercepts ciphertext, obtains stored encrypted values, or otherwise acquires protected data can perform offline cryptanalysis to recover plaintext. No user interaction and no authentication are required. The attack does not modify data or affect service availability; success yields disclosure of sensitive information such as credentials, tokens, or business data protected by the weak algorithm.

No public proof-of-concept exploit is available. See the IBM Support Page for vendor-provided technical details.

Detection Methods for CVE-2025-36084

Indicators of Compromise

Presence of IBM Concert deployments running versions 1.0.0 through 3.0.0 without vendor-supplied cryptographic updates.
Cryptographic artifacts, configuration files, or key material referencing deprecated algorithms such as DES, 3DES, RC4, MD5, or SHA-1 within IBM Concert components.
Network traffic to or from IBM Concert endpoints negotiating legacy TLS ciphers or exposing legacy protocol versions.

Detection Strategies

Inventory IBM Concert instances and validate the running version against the affected range published in the IBM advisory.
Review IBM Concert configuration and key stores for algorithm identifiers associated with weak primitives listed under [CWE-327].
Perform TLS and application-layer scans against IBM Concert services to enumerate supported ciphers and identify weak negotiations.

Monitoring Recommendations

Log and alert on access to IBM Concert data stores and backup artifacts that may contain encrypted sensitive information.
Monitor for bulk retrieval of ciphertext from IBM Concert databases or object storage, which could indicate preparation for offline decryption.
Track outbound transfers of IBM Concert configuration exports or key material to unmanaged destinations.

How to Mitigate CVE-2025-36084

Immediate Actions Required

Identify all IBM Concert deployments in the 1.0.0 through 3.0.0 range and prioritize them for remediation.
Apply the fix or upgrade guidance published on the IBM Support Page as soon as it is available in your change window.
Rotate any credentials, API keys, or secrets that were previously encrypted by the affected IBM Concert versions.

Patch Information

IBM has published remediation guidance for CVE-2025-36084 on the vendor advisory at the IBM Support Page. Administrators should follow the version-specific upgrade or fix pack instructions provided by IBM and validate that the updated deployment uses approved cryptographic algorithms.

Workarounds

Restrict network access to IBM Concert management and data interfaces to trusted administrative networks only.
Enforce TLS 1.2 or higher with modern cipher suites on all channels used to transport IBM Concert data.
Encrypt IBM Concert backups and exports with an external, standards-compliant cryptographic solution until the vendor fix is deployed.

bash

# Configuration example
# Enumerate cipher suites offered by an IBM Concert endpoint to identify weak algorithms
nmap --script ssl-enum-ciphers -p 443 concert.example.internal

# Filter for weak primitives commonly associated with CWE-327
nmap --script ssl-enum-ciphers -p 443 concert.example.internal \
  | grep -Ei 'RC4|3DES|DES|MD5|SHA1|EXPORT|NULL'