CVE-2021-1204Network attack vector

Root command execution via malformed HTTP input

Published Jan 13, 2021 · Updated Nov 12, 2024

Command injection in Cisco Small Business RV110W, RV130, RV130W, and RV215W routers allows remote authenticated attackers to execute root code. The web management interface improperly validates user-supplied fields in crafted HTTP requests, passing attacker-controlled input to operating-system command handling. Valid administrator credentials and access to the management interface are required; exploitation can run code as root or reload the router, interrupting service.

CVSS severity7.2
High
EPSS probability2.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Cisco Small Business RV110W, RV130, RV130W, and RV215W routers allows remote authenticated attackers to execute root code. The web management interface improperly validates user-supplied fields in crafted HTTP requests, passing attacker-controlled input to operating-system command handling. Valid administrator credentials and access to the management interface are required; exploitation can run code as root or reload the router, interrupting service.

The record

CVE
CVE-2021-1204
Published
Jan 13, 2021
Updated
Nov 12, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-20, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Small Business RV Series Router Firmwareversion=n/a

Published CVSS scores

7.2CiscoCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

No public exploit references are available in this record.

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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