CVE-2020-3546

mediumpriority · track · 21EPSS 0.011 · 65 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.07% (65th) EPSS

CVSS 5 · medium

Is it mine?

4 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the web-based management interface of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to insufficient validation of requests that are sent to the web-based management interface. An attacker could exploit this vulnerability by sending a crafted request to the interface of an affected device. A successful exploit could allow the attacker to obtain the IP addresses that are configured on the internal interfaces of the affected device. There is a workaround that addresses this vulnerability.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Email Security Appliance (ESA)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
WorkaroundCisco Email Security Appliance (ESA)cisco_csaf
There is a workaround that addresses this vulnerability. In setups that do not involve Network Address Translation (NAT), enabling the Host header protection feature would prevent exploitation of this vulnerability. The following example shows how to use the adminaccessconfig command, followed by the HOSTHEADER operation, to enable the Host header protection feature: mail.example.com> adminaccessconfig Choose the operation you want to perform: - BANNER - Configure login message (banner) for appliance administrator login. - WELCOME - Configure welcome message (post login message) for appliance administrator login. - IPACCESS - Configure IP-based access for appliance administrative interface. - CSRF - Configure web UI Cross-Site Request Forgeries protection. - XSS - Configure Cross-Site Scripting Attack protection. - HOSTHEADER - Configure option to use host header in HTTP requests. - TIMEOUT - Configure GUI and CLI session inactivity timeout. - MAXHTTPHEADERFIELDSIZE - Configure maximum HTTP header Field size. - HOW-TOS - Configure How-Tos feature. []> HOSTHEADER

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

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

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

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · Cisco PSIRT US

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU

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

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (4)

Products and version ranges known to be affected.

Cisco Cisco Email Security Appliance (ESA)all versionscisco_csafUS
Cisco Cisco Email Security Appliance (ESA)≤ n/aenisa_euvdEU
Cisco Systems Inc. AsyncOS≤ 13.5.1fstec_bduRU
cisco asyncos≤ 13.5.1nvdUScpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-esa-info-disclosure-vMJMMgJCisco Email Security Appliance Information Disclosure Vulnerability2020-09-02csaf · cisco_csafUS
A vulnerability in the web-based management interface of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to insufficient validation of requests that are sent to the web-based management interface. An attacker could exploit this vulnerability by sending a crafted request to the interface of an affected device. A successful exploit could allow the attacker to obtain the IP addresses that are configured on the internal interfaces of the affected device. There is a workaround that addresses this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-info-disclosure-vMJMMgJ ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-info-disclosure-vMJMMgJ"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-09-04modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

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