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CVE-2011-2487

MEDIUM

CVE-2011-2487 is a medium-severity (CVSS 5.9) Broken Cryptographic Algorithm vulnerability in apache cxf. O3 Security detects and blocks CVE-2011-2487 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

The implementations of PKCS#1 v1.5 key transport mechanism for XMLEncryption in JBossWS and Apache WSS4J before 1.6.5 is susceptible to a Bleichenbacher attack.

Published
Mar 11, 2020
Updated
Jun 16, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

Description

The implementations of PKCS#1 v1.5 key transport mechanism for XMLEncryption in JBossWS and Apache WSS4J before 1.6.5 is susceptible to a Bleichenbacher attack.

Affected Products

10 products · 12 configurations
Application
cxfapache
≥ 2.5.0 && ≤ 2.5.2
range
Application
wss4japache
< 1.6.5
range
Application
jboss business rules management systemredhat
1 version
5.3
Application
jboss enterprise application platformredhat
1 version
5.0.0
Application
jboss enterprise application platform text-only advisoriesredhat
all
Application
jboss enterprise soa platformredhat
2 versions
4.2.04.3.0

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every apache cxf deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the apache cxf security patch or hotfix for CVE-2011-2487 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2011-2487 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2011-2487. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The implementations of PKCS#1 v1.5 key transport mechanism for XMLEncryption in JBossWS and Apache WSS4J before 1.6.5 is susceptible to a Bleichenbacher attack.
O3 Security · Runtime Protection

Is CVE-2011-2487 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2011-2487 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.