CVE-2020-5895

Local AVRD crash via world-writable socket

Published May 7, 2020 · Updated Aug 4, 2024

Incorrect socket permissions in F5 Networks NGINX Controller 3.1.0 through 3.3.0 allow local users to crash AVRD. AVRD creates its local socket with world-readable and world-writable permissions, letting unintended processes submit arbitrary data to the service. Any local user or process that can reach the socket can send a malformed message that triggers a segmentation fault and interrupts AVRD.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect socket permissions in F5 Networks NGINX Controller 3.1.0 through 3.3.0 allow local users to crash AVRD. AVRD creates its local socket with world-readable and world-writable permissions, letting unintended processes submit arbitrary data to the service. Any local user or process that can reach the socket can send a malformed message that triggers a segmentation fault and interrupts AVRD.

The record

CVE
CVE-2020-5895
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
F5 Networks
Product
NGINX Controller
Classifications
CWE-732, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

F5 Networks · NGINX Controllerversion=< 3.4.0

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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