CVE-2021-25310Public exploitNetwork attack vector

Root command execution via unsanitized language parameter

Published Feb 2, 2021 · Updated Aug 3, 2024

OS command injection in Belkin Linksys WRT160NL 1.0.04 build 2 allows remote authenticated users to execute commands as root. The do_upgrade_post function in mini_httpd inserts the ui_language POST value into a cp command with snprintf and passes it to system without validation or encoding. Access to the administration web interface and a valid session are required; injected shell metacharacters permit complete control of the router.

CVSS severity8.8
High
EPSS probability4.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Belkin Linksys WRT160NL 1.0.04 build 2 allows remote authenticated users to execute commands as root. The do_upgrade_post function in mini_httpd inserts the ui_language POST value into a cp command with snprintf and passes it to system without validation or encoding. Access to the administration web interface and a valid session are required; injected shell metacharacters permit complete control of the router.

The record

CVE
CVE-2021-25310
Published
Feb 2, 2021
Updated
Aug 3, 2024
Vendor
Belkin
Product
Linksys WRT160NL
Classifications
CWE-150, CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Belkin · Linksys WRT160NLversion=-

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-150Improper Neutralization of Escape, Meta, or Control Sequences
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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