CVE-2021-1561Network attack vector

Cross-user quarantine access via improper authorization

Published Aug 18, 2021 · Updated Nov 7, 2024

Improper authorization in Cisco Secure Email and Web Manager before 14.1 allows remote authenticated users to access other users' quarantines. The spam quarantine interface accepts malicious authenticated requests without properly restricting access to the requesting user's quarantine. A valid user account is required; exploitation exposes stored email and permits changes to another user's quarantine settings or security controls.

CVSS severity5.4
Medium
EPSS probability0.74%
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 Secure Email and Web Manager before 14.1 allows remote authenticated users to access other users' quarantines. The spam quarantine interface accepts malicious authenticated requests without properly restricting access to the requesting user's quarantine. A valid user account is required; exploitation exposes stored email and permits changes to another user's quarantine settings or security controls.

The record

CVE
CVE-2021-1561
Published
Aug 18, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Content Security Management Appliance
Classifications
CWE-302
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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 privilegesauthenticated

What is affected?

ClamAV · Cisco Content Security Management Applianceversion=n/a

Published CVSS scores

5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
5.4CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-302Authentication Bypass by Assumed-Immutable Data

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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