CVE-2022-20699Known exploitationPublic exploitNetwork attack vector

Unauthenticated root code execution via SSL VPN overflow

Published Feb 10, 2022 · Updated Oct 21, 2025

Stack-based buffer overflow in Cisco RV340 and RV345 Series firmware 1.0.03.24 and earlier allows remote attackers to execute code as root. The SSL VPN service copies user-supplied data into a fixed-length stack buffer without validating its length. A crafted HTTP request reaches the default TCP 8443 SSL VPN service without authentication, enabling full device compromise.

CVSS severity10.0
Critical
EPSS probability72.46%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Cisco RV340 and RV345 Series firmware 1.0.03.24 and earlier allows remote attackers to execute code as root. The SSL VPN service copies user-supplied data into a fixed-length stack buffer without validating its length. A crafted HTTP request reaches the default TCP 8443 SSL VPN service without authentication, enabling full device compromise.

The record

CVE
CVE-2022-20699
Published
Feb 10, 2022
Updated
Oct 21, 2025
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2022Exploitation reportedCISA Known Exploited Vulnerabilities catalog listing
  3. Oct 21, 2025Record 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

9.8Trend Micro Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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