CVE-2021-1516

mediumpriority · track · 26EPSS 0.010 · 63 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.00% (63rd) EPSS

CVSS 4 · medium

Is it mine?

16 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 Content Security Management Appliance (SMA), Cisco Email Security Appliance (ESA), and Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability exists because confidential information is included in HTTP requests that are exchanged between the user and the device. An attacker could exploit this vulnerability by looking at the raw HTTP requests that are sent to the interface. A successful exploit could allow the attacker to obtain some of the passwords that are configured throughout the interface.

remediations

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

A vendor fix is available.

FixedCisco Secure Emailcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Email and Web Managercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Secure Web Appliancecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

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

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04mediumAV:N/AC:L/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.14.3mediumAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · psirt@cisco.com USexploitability 2.8 · impact 1.4

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · Cisco PSIRT US

ssvc

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

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-540USCWE-540US

affected products (16)

Products and version ranges known to be affected.

Cisco Cisco Secure Emailall versionscisco_csafUS
Cisco Cisco Secure Email and Web Managerall versionscisco_csafUS
Cisco Cisco Secure Web Applianceall versionscisco_csafUS
Cisco Cisco Web Security Appliance (WSA)≤ n/aenisa_euvdEU
Cisco Systems Inc. AsyncOS≤ 14.0fstec_bduRU
Cisco Systems Inc. Cisco Email Security Appliancesall versionsfstec_bduRU
Cisco Systems Inc. Cisco Web Security Applianceall versionsfstec_bduRU
Cisco Systems Inc. Content Security Management Applianceall versionsfstec_bduRU
cisco content security management applianceall versionsnvdUScpe:2.3:a:cisco:content_security_management_appliance:*:*:*:*:*:*:*:*
cisco email security applianceall versionsnvdUScpe:2.3:a:cisco:email_security_appliance:*:*:*:*:*:*:*:*
cisco ironport web security appliance= 13.6.2-023nvdUScpe:2.3:a:cisco:ironport_web_security_appliance:*:*:*:*:*:*:*:*
cisco ironport web security appliance= 14.0.0-090nvdUScpe:2.3:a:cisco:ironport_web_security_appliance:*:*:*:*:*:*:*:*
cisco ironport web security appliance= 14.0.0-133nvdUScpe:2.3:a:cisco:ironport_web_security_appliance:*:*:*:*:*:*:*:*
cisco ironport web security appliance= 14.0.0-292nvdUScpe:2.3:a:cisco:ironport_web_security_appliance:*:*:*:*:*:*:*:*
cisco ironport web security appliance= 14.0.0-300nvdUScpe:2.3:a:cisco:ironport_web_security_appliance:*:*:*:*:*:*:*:*
cisco web security applianceall versionsnvdUScpe:2.3:a:cisco:web_security_appliance:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-esa-wsa-sma-info-gY2AEz2HCisco Content Security Management Appliance, Email Security Appliance, and Web Security Appliance Information Disclosure Vulnerability2021-05-05csaf · cisco_csafUS
A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Content Security Management Appliance (SMA), Cisco Email Security Appliance (ESA), and Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability exists because confidential information is included in HTTP requests that are exchanged between the user and the device. An attacker could exploit this vulnerability by looking at the raw HTTP requests that are sent to the interface. A successful exploit could allow the attacker to obtain some of the passwords that are configured throughout the interface. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

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 2021-05-06modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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