CVE-2022-20789Network attack vector

Root-level file write via crafted upgrade variables

Published Apr 21, 2022 · Updated Nov 6, 2024

Arbitrary file write in Cisco Unified Communications Manager allows remote authenticated users to alter system files during upgrades. The software-upgrade path passes crafted variables to an improperly restricted system script, which overwrites or appends attacker-controlled data with root privileges. High-privilege authentication and execution of a system upgrade are required; successful exploitation corrupts selected system files.

CVSS severity4.9
Medium
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Cisco Unified Communications Manager allows remote authenticated users to alter system files during upgrades. The software-upgrade path passes crafted variables to an improperly restricted system script, which overwrites or appends attacker-controlled data with root privileges. High-privilege authentication and execution of a system upgrade are required; successful exploitation corrupts selected system files.

The record

CVE
CVE-2022-20789
Published
Apr 21, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Unified Communications Manager
Classifications
CWE-73, T1565.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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 Unified Communications Managerversion=n/a

Published CVSS scores

8.5NIST NVDAV:N/AC:L/Au:S/C:N/I:C/A:C
4.9Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1565.001Stored Data Manipulation: Local Data Manipulation

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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