CVE-2023-20073Network attack vector

Unauthenticated file upload via missing authorization

Published Apr 5, 2023 · Updated Oct 28, 2024

Improper authorization in Cisco RV340-series firmware 1.0.03.29 and earlier allows remote attackers to upload arbitrary files via HTTP. The web management interface accepts crafted file-upload requests without enforcing authorization for the upload operation. No authentication is required; the result is an attacker-chosen file written to the appliance, with no reported read, execution, or availability impact.

CVSS severity5.3
Medium
EPSS probability90.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Cisco RV340-series firmware 1.0.03.29 and earlier allows remote attackers to upload arbitrary files via HTTP. The web management interface accepts crafted file-upload requests without enforcing authorization for the upload operation. No authentication is required; the result is an attacker-chosen file written to the appliance, with no reported read, execution, or availability impact.

The record

CVE
CVE-2023-20073
Published
Apr 5, 2023
Updated
Oct 28, 2024
Vendor
ClamAV
Product
Cisco Small Business RV Series Router Firmware
Classifications
CWE-434, T1105
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.3Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X

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-434Unrestricted Upload of File with Dangerous Type
T1105Ingress Tool Transfer

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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