CVE-2023-20237

Internal service access via insufficient proxy restrictions

Published Aug 16, 2023 · Updated Aug 2, 2024

Access control bypass in Cisco Intersight Virtual Appliance 1.0.9-503 through 1.0.9-558 allows remote attackers to access internal HTTP services. An internally accessible HTTP proxy applies insufficient destination restrictions when processing a crafted CLI command, forwarding requests beyond the caller's intended network scope. Exploitation requires adjacent network access but no authentication or user interaction, exposing otherwise unreachable internal subnets to HTTP requests.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control bypass in Cisco Intersight Virtual Appliance 1.0.9-503 through 1.0.9-558 allows remote attackers to access internal HTTP services. An internally accessible HTTP proxy applies insufficient destination restrictions when processing a crafted CLI command, forwarding requests beyond the caller's intended network scope. Exploitation requires adjacent network access but no authentication or user interaction, exposing otherwise unreachable internal subnets to HTTP requests.

The record

CVE
CVE-2023-20237
Published
Aug 16, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Intersight Virtual Appliance
Classifications
CWE-284, T1090
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 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

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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=1.0.9-503
  2. Affected versionversion=1.0.9-536
  3. Affected versionversion=1.0.9-538
  4. Affected versionversion=1.0.9-558
  5. Affected versionversion=1.0.9-561

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Intersight Virtual Applianceversion=1.0.9-503; version=1.0.9-536; version=1.0.9-538; version=1.0.9-558; version=1.0.9-561

Published CVSS scores

4.3Cisco Systems, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1090Proxy

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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