CVE-2022-20881Network attack vector

Root command execution or restart via unvalidated fields

Published Jul 21, 2022 · Updated Nov 6, 2024

Buffer overflow in Cisco Small Business RV router firmware allows remote authenticated users to execute root commands or restart devices. The web management interface inadequately validates user-controlled fields in crafted HTTP packets; Cisco does not identify the affected handlers or copy operations. Valid Administrator credentials and LAN access, or WAN access when remote management is enabled, are required; exploitation grants root-level command execution or forces an unexpected restart.

CVSS severity4.7
Medium
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Cisco Small Business RV router firmware allows remote authenticated users to execute root commands or restart devices. The web management interface inadequately validates user-controlled fields in crafted HTTP packets; Cisco does not identify the affected handlers or copy operations. Valid Administrator credentials and LAN access, or WAN access when remote management is enabled, are required; exploitation grants root-level command execution or forces an unexpected restart.

The record

CVE
CVE-2022-20881
Published
Jul 21, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-120, CWE-78, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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=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

7.2NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.7Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

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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