CVE-2023-20057

mediumpriority · track · 21EPSS 0.007 · 52 %ileDERUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.68% (52nd) EPSS

CVSS 5.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

A vulnerability in the URL filtering mechanism of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device. This vulnerability is due to improper processing of URLs. An attacker could exploit this vulnerability by crafting a URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · none–medium · 0–5.3

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.14.7mediumAV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.10noneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Nsecondary · psirt@cisco.com USexploitability 2.8 · impact 0

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-74USprimaryCWE-254USCWE-284USCWE-792US

affected products (3)

Products and version ranges known to be affected.

Cisco Email Security Applianceall versionscert_bundDEcpe:/h:cisco:email_security_appliance:-
Cisco Systems Inc. AsyncOSall versionsfstec_bduRU
cisco asyncosall versionsnvdUScpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0153Cisco Email Security Appliance: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2023-01-18csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Email Security Appliance ausnutzen, um Sicherheitsvorkehrungen zu umgehen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2023-01-20modified 2026-06-17

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+5974 more

references (4)

External citations — patches, advisories, analysis.

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