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AsyncosOperating system · Cisco

CVE-2024-20383

HIGH · 8.4 CVSS v3.1 Published 2024-05-15
Fix available
A fix is available. Upgrade to 15.5.1-024 or later.
See remediation →
88/100
Remediation priority · High
Remotely reachable

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web Manager could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A stored XSS vulnerability exists in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web Manager. The vulnerability stems from insufficient validation of user-supplied input, allowing an authenticated attacker to inject malicious script through a crafted link that executes in the context of the affected interface.

MitigationApply the vendor patch or update to Cisco AsyncOS Software when released. Until then, exercise caution with links in the management interface and consider network segmentation to limit exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
AsyncosOperating system
Affected:< 15.5.1-024

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Cisco Secure Email and Web Manager deployment
    Locate systems running Cisco Secure Email and Web Manager or Cisco AsyncOS in your environment. Check network inventory or physically access the appliance CLI.
    Affected if The product is present in your environment
  2. Check AsyncOS version
    Access the appliance CLI and run the 'version' command, or log into the web-based management interface and navigate to the System Administration > Upgrade section to view the installed AsyncOS version.
    Affected if The installed version is lower than 15.5.1-024
  3. Verify web-based management interface is enabled
    From the CLI, run 'interfaceconfig' or access the web interface on the expected management port (typically 8443 or 443). Confirm the web-based management interface is active.
    Affected if The web-based management interface is enabled and accessible

You are affected if you are running Cisco Secure Email and Web Manager with AsyncOS version below 15.5.1-024 and the web-based management interface is enabled, allowing an authenticated attacker to inject malicious scripts.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 15.5.1-024 or later
Fixed in 15.5.1-024
Interim mitigation

Apply the vendor patch or update to Cisco AsyncOS Software when released. Until then, exercise caution with links in the management interface and consider network segmentation to limit exposure.

Recommended fix High confidence

AsyncOS 15.5.1-024 or later

  1. 1. Identify the current AsyncOS version by navigating to the web-based management interface and checking the System Administration > Software Updates section, or by running the 'version' command in the CLI.
  2. 2. Confirm the current version is below 15.5.1-024, which indicates the device is vulnerable.
  3. 3. Schedule a maintenance window as upgrades may require brief downtime.
  4. 4. Download the fixed AsyncOS release (15.5.1-024 or later) from the Cisco Software Download center at software.cisco.com, ensuring you have a valid service contract.
  5. 5. Back up the current configuration from the web interface (System Administration > Configuration File) or CLI using the 'mailconfig' or 'saveconfig' commands.
  6. 6. Upload and install the update through the web interface (System Administration > Software Updates > Install Update) or CLI using the 'update' command.
  7. 7. After installation, verify the new version is 15.5.1-024 or later and confirm all services are operational.
  8. 8. Review system logs to confirm the upgrade completed successfully and no errors occurred.
Caveat Review Cisco release notes for 15.5.1-024 for any configuration or behavioral changes; some feature deprecations may occur between major versions.

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Asyncos Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-20383 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data