CVE-2021-1196Network attack vector

Root code execution or reload via stack overflows

Published Jan 13, 2021 · Updated Nov 12, 2024

Stack-based buffer overflows in Cisco RV110W, RV130, RV130W, and RV215W routers allow remote authenticated users to execute code as root. The web management interface improperly validates data in crafted HTTP requests, allowing input to overflow stack buffers; Cisco does not identify the affected handlers or parameters. Valid administrator credentials and network access to the LAN interface, or to WAN management when enabled, are required; exploitation can also reload the device.

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

Stack-based buffer overflows in Cisco RV110W, RV130, RV130W, and RV215W routers allow remote authenticated users to execute code as root. The web management interface improperly validates data in crafted HTTP requests, allowing input to overflow stack buffers; Cisco does not identify the affected handlers or parameters. Valid administrator credentials and network access to the LAN interface, or to WAN management when enabled, are required; exploitation can also reload the device.

The record

CVE
CVE-2021-1196
Published
Jan 13, 2021
Updated
Nov 12, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-121, T1210
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?

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

7.2CiscoCVSS: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-121Stack-based 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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