CVE-2022-20901Network attack vector

Root-level code execution via unchecked HTTP fields

Published Jul 21, 2022 · Updated Nov 6, 2024

Buffer overflow in Cisco Small Business RV router web interfaces allows remote authenticated users to execute root-level code or reboot devices. The interface fails to validate the size of user-controlled fields in crafted HTTP packets, enabling a classic buffer overflow. Valid Administrator credentials are required; reachability is always available from the LAN and from the WAN only when remote management is enabled.

CVSS severity4.7
Medium
EPSS probability1.05%
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 web interfaces allows remote authenticated users to execute root-level code or reboot devices. The interface fails to validate the size of user-controlled fields in crafted HTTP packets, enabling a classic buffer overflow. Valid Administrator credentials are required; reachability is always available from the LAN and from the WAN only when remote management is enabled.

The record

CVE
CVE-2022-20901
Published
Jul 21, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-120, T1210
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

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
7.2NIST NVDCVSS: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.

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')
T1210Exploitation of Remote Services

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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