CVE-2023-20272Network attack vector

Authenticated file replacement via insufficient upload validation

Published Nov 21, 2023 · Updated Aug 2, 2024

Arbitrary file write in affected Cisco Identity Services Engine 3.0 and 3.1 releases allows remote authenticated users to replace web-root files. The management interface accepts an uploaded file for the application web root without sufficient file-input validation, permitting an existing file to be overwritten. Valid device credentials are required; successful exploitation exposes sensitive server-side information and alters hosted content.

CVSS severity8.8
High
EPSS probability0.89%
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 affected Cisco Identity Services Engine 3.0 and 3.1 releases allows remote authenticated users to replace web-root files. The management interface accepts an uploaded file for the application web root without sufficient file-input validation, permitting an existing file to be overwritten. Valid device credentials are required; successful exploitation exposes sensitive server-side information and alters hosted content.

The record

CVE
CVE-2023-20272
Published
Nov 21, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-424, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=3.0.0
  2. Affected versionversion=3.0.0 p1
  3. Affected versionversion=3.0.0 p2
  4. Affected versionversion=3.0.0 p3
  5. Affected versionversion=3.0.0 p4
  6. Affected versionversion=3.0.0 p5
  7. Affected versionversion=3.0.0 p6
  8. Affected versionversion=3.0.0 p7
  9. Affected versionversion=3.1.0
  10. Affected versionversion=3.1.0 p1
  11. Affected versionversion=3.1.0 p3
  12. Affected versionversion=3.1.0 p4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Identity Services Engineversion=3.0.0; version=3.0.0 p1; version=3.0.0 p2; version=3.0.0 p3; version=3.0.0 p4; version=3.0.0 p5; version=3.0.0 p6; version=3.0.0 p7; version=3.1.0; version=3.1.0 p1; version=3.1.0 p3; version=3.1.0 p4

Published CVSS scores

6.7Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-424Improper Protection of Alternate Path
T1105Ingress Tool Transfer

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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