CVE-2022-20807Network attack vector

Local-file disclosure via external entity resolution

Published May 27, 2022 · Updated Nov 6, 2024

XXE injection in Cisco TelePresence VCS Expressway before 14.0.7 allows remote authenticated users to read local files via XML uploads. Its file-parsing logic resolves external entity references in uploaded XML instead of rejecting them, returning files from the underlying system. Read/write privileges are required, and the default configuration is affected; the disclosed consequence is sensitive-file exposure.

CVSS severity4.9
Medium
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE injection in Cisco TelePresence VCS Expressway before 14.0.7 allows remote authenticated users to read local files via XML uploads. Its file-parsing logic resolves external entity references in uploaded XML instead of rejecting them, returning files from the underlying system. Read/write privileges are required, and the default configuration is affected; the disclosed consequence is sensitive-file exposure.

The record

CVE
CVE-2022-20807
Published
May 27, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco TelePresence Video Communication Server (VCS) Expressway
Classifications
CWE-611, T1005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 27, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco TelePresence Video Communication Server (VCS) Expresswayversion=n/a

Published CVSS scores

4.9Cisco PSIRTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

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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