CVE-2023-20088Network attack vector

Service interruption via improper proxy IP filtering

Published Mar 3, 2023 · Updated Oct 28, 2024

Improper authorization in Cisco Finesse before 12.6(1) ES7 allows remote attackers to interrupt proxied desktop traffic. The VPN-less nginx reverse proxy filters source IP addresses incorrectly, so requests relayed by a load balancer trigger blocking against its shared address. Exploitation requires that deployment model; repeated unauthenticated requests drop current and subsequent proxied traffic.

CVSS severity5.3
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Cisco Finesse before 12.6(1) ES7 allows remote attackers to interrupt proxied desktop traffic. The VPN-less nginx reverse proxy filters source IP addresses incorrectly, so requests relayed by a load balancer trigger blocking against its shared address. Exploitation requires that deployment model; repeated unauthenticated requests drop current and subsequent proxied traffic.

The record

CVE
CVE-2023-20088
Published
Mar 3, 2023
Updated
Oct 28, 2024
Vendor
ClamAV
Product
Cisco Unified Contact Center Enterprise
Classifications
CWE-285, T1499
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

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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 privilegesunauthenticated

What is affected?

ClamAV · Cisco Unified Contact Center Enterpriseversion=n/a

Published CVSS scores

5.3CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1499Endpoint Denial of Service

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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