CVE-2020-3295Network attack vector

Authenticated stack overflow code execution

Published Jun 18, 2020 · Updated Nov 15, 2024

Stack overflow in Cisco Small Business RV router firmware allows remote authenticated administrators to execute arbitrary code. The web-based management interface passes attacker-controlled oversized values to scripts without sufficient boundary restrictions, overwriting stack memory and producing a crash or root-level code execution. Exploitation requires administrative login to the interface; remote management is disabled by default, and Cisco reports no malicious use.

CVSS severity7.2
High
EPSS probability3.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Cisco Small Business RV router firmware allows remote authenticated administrators to execute arbitrary code. The web-based management interface passes attacker-controlled oversized values to scripts without sufficient boundary restrictions, overwriting stack memory and producing a crash or root-level code execution. Exploitation requires administrative login to the interface; remote management is disabled by default, and Cisco reports no malicious use.

The record

CVE
CVE-2020-3295
Published
Jun 18, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-119, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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:3.0/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-119Buffer Overflow
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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