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CVE-2013-4409

CRITICAL

CVE-2013-4409 is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in fedoraproject fedora. O3 Security detects and blocks CVE-2013-4409 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

An eval() vulnerability exists in Python Software Foundation Djblets 0.7.21 and Beanbag Review Board before 1.7.15 when parsing JSON requests.

Published
Nov 4, 2019
Updated
Jun 16, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

Description

An eval() vulnerability exists in Python Software Foundation Djblets 0.7.21 and Beanbag Review Board before 1.7.15 when parsing JSON requests.

Affected Products

4 products · 6 configurations
OS
fedorafedoraproject
3 versions
181920
OS
enterprise linuxredhat
1 version
6.0
Application
djbletsreviewboard
1 version
0.7.21
Application
review boardreviewboard
< 1.7.15
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every fedoraproject fedora 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 fedoraproject fedora security patch or hotfix for CVE-2013-4409 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-2013-4409 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-2013-4409. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

An eval() vulnerability exists in Python Software Foundation Djblets 0.7.21 and Beanbag Review Board before 1.7.15 when parsing JSON requests.
O3 Security · Runtime Protection

Is CVE-2013-4409 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2013-4409 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.