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CVE-2014-1858

MEDIUM

CVE-2014-1858 is a medium-severity (CVSS 5.5) Improper Input Validation vulnerability in numpy numpy. O3 Security detects and blocks CVE-2014-1858 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

__init__.py in f2py in NumPy before 1.8.1 allows local users to write to arbitrary files via a symlink attack on a temporary file.

Published
Jan 8, 2018
Updated
Jun 17, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

Description

init.py in f2py in NumPy before 1.8.1 allows local users to write to arbitrary files via a symlink attack on a temporary file.

Affected Products

1 product · 1 configurations
Application
numpynumpy
< 1.8.1
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every numpy numpy 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 numpy numpy security patch or hotfix for CVE-2014-1858 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-2014-1858 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-2014-1858. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

__init__.py in f2py in NumPy before 1.8.1 allows local users to write to arbitrary files via a symlink attack on a temporary file.
O3 Security · Runtime Protection

Is CVE-2014-1858 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2014-1858 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.