CVE-2022-20784Network attack vector

Unauthenticated policy bypass via crafted URL characters

Published Apr 6, 2022 · Updated Nov 6, 2024

URL filter bypass in Cisco Secure Web Appliance 11.7 through 14.0.1 allows remote attackers to access policy-blocked web content. The Web-Based Reputation Score engine mishandles specific character combinations in a crafted URL instead of applying the established request policy. No authentication or user interaction is required; routing the URL through an affected proxy grants access only to otherwise blocked web content.

CVSS severity5.8
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL filter bypass in Cisco Secure Web Appliance 11.7 through 14.0.1 allows remote attackers to access policy-blocked web content. The Web-Based Reputation Score engine mishandles specific character combinations in a crafted URL instead of applying the established request policy. No authentication or user interaction is required; routing the URL through an affected proxy grants access only to otherwise blocked web content.

The record

CVE
CVE-2022-20784
Published
Apr 6, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Secure Web Appliance
Classifications
CWE-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 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 privilegesunauthenticated

What is affected?

ClamAV · Cisco Secure Web Applianceversion=n/a

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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