CVE-2021-1294Network attack vector

Unauthenticated root code execution via crafted HTTP requests

Published Feb 4, 2021 · Updated Nov 8, 2024

Improper input validation in Cisco RV160 and RV260 series router firmware before 1.0.01.02 allows remote attackers to execute code as root. The web-based management interface accepts crafted HTTP requests without properly validating their parameters, but Cisco has not disclosed the affected handler or exact parsing error. No authentication or user interaction is required; successful exploitation grants root-level control of the router.

CVSS severity9.8
Critical
EPSS probability4.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Cisco RV160 and RV260 series router firmware before 1.0.01.02 allows remote attackers to execute code as root. The web-based management interface accepts crafted HTTP requests without properly validating their parameters, but Cisco has not disclosed the affected handler or exact parsing error. No authentication or user interaction is required; successful exploitation grants root-level control of the router.

The record

CVE
CVE-2021-1294
Published
Feb 4, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-472, CAPEC-31, CAPEC-226, CAPEC-146, CAPEC-39, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 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 privilegesunauthenticated

What is affected?

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

Published CVSS scores

9.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
10.0NIST NVDAV:N/AC:L/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-472External Control of Assumed-Immutable Web Parameter
CAPEC-31Accessing/Intercepting/Modifying HTTP Cookies
CAPEC-226Session Credential Falsification through Manipulation
CAPEC-146XML Schema Poisoning
CAPEC-39Manipulating Opaque Client-based Data Tokens
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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