CVE-2023-20079Network attack vector

Device reload via insufficient request validation

Published Mar 3, 2023 · Updated Oct 28, 2024

Denial of service in Cisco IP Phones with Multiplatform Firmware allows remote attackers to reload devices through the web interface. The web-based management interface insufficiently validates user-supplied input when processing a crafted request; Cisco has not identified the affected handler or malformed field. No authentication or user interaction is required, and the documented consequence is a device reboot that interrupts phone service.

CVSS severity7.5
High
EPSS probability10.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Cisco IP Phones with Multiplatform Firmware allows remote attackers to reload devices through the web interface. The web-based management interface insufficiently validates user-supplied input when processing a crafted request; Cisco has not identified the affected handler or malformed field. No authentication or user interaction is required, and the documented consequence is a device reboot that interrupts phone service.

The record

CVE
CVE-2023-20079
Published
Mar 3, 2023
Updated
Oct 28, 2024
Vendor
ClamAV
Product
Cisco IP Phones with Multiplatform Firmware
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 IP Phones with Multiplatform Firmwareversion=n/a

Published CVSS scores

7.5Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo