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NVD / CVE Program· CNA cisco

CVE-2024-20504: Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance Stored Cross-Site Scripting Vulnerabilities

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance could allow an authenticated, remote attacker to conduct a stored cross-site scripting (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.

MediumCVSS 5.4 · v3.1—No exploit No fix recorded
Published
Nov 6, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 22th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · cisco
5.4
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-20504

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ciscoasyncos
ciscosecure email gateway virtual appliance c100v
ciscosecure email gateway virtual appliance c300v
ciscosecure email gateway virtual appliance c600v
ciscosecure email gateway c195
ciscosecure email gateway c395
ciscosecure email gateway c695
ciscosecure email and web manager virtual appliance m100v
ciscosecure email and web manager virtual appliance m300v
ciscosecure email and web manager virtual appliance m600v
ciscosecure email and web manager m170
ciscosecure email and web manager m190

and 16 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cisco asyncos14.0.0-404
  • cisco asyncos14.0.0-698
  • cisco asyncos14.0.2-012
  • cisco asyncos14.0.3-014
  • cisco asyncos14.0.4-005
  • cisco asyncos14.0.5-007
  • cisco asyncos14.1.0-032
  • cisco asyncos14.1.0-041
  • cisco asyncos14.1.0-047
  • cisco asyncos14.1.0-223
  • cisco asyncos14.1.0-227
  • cisco asyncos14.2.0-212
  • cisco asyncos14.2.0-224
  • cisco asyncos14.2.0-620
  • cisco asyncos14.2.1-020
  • cisco asyncos14.3.0-032
  • cisco asyncos14.3.0-120
  • cisco asyncos14.5.0-498
  • cisco asyncos14.5.1-008
  • cisco asyncos14.5.1-016

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

  • Cisco Cisco Secure Email

    • 14.0.0-698, 14.2.0-620, 14.2.1-020, 14.3.0-032, 15.0.0-104, 15.0.1-030, 15.5.0-048, 15.5.1-055affected

  • Cisco Cisco Secure Email and Web Manager

    • 14.0.0-404, 14.1.0-223, 14.1.0-227, 14.2.0-212, 14.2.0-224, 14.2.1-020, 14.3.0-120, 15.0.0-334, 15.5.1-024, 15.5.1-029affected

  • Cisco Cisco Secure Web Appliance

    • 14.1.0-032, 14.1.0-047, 14.1.0-041, 14.0.2-012, 14.5.0-498, 14.0.3-014, 14.0.4-005, 14.5.1-008, 14.5.1-016, 15.0.0-355, 15.0.0-322, 15.1.0-287 … (+7)affected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-20393Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution VulnerabilityKEV
    80Now
  • CVE-2026-76461Cisco Secure Email Gateway SQL Injection VulnerabilityKEV
    78This week
  • CVE-2026-76519Cisco Secure Email Gateway Arbitrary File Write VulnerabilityKEV
    70This week

Published before and after this one in the same product

  • ← EarlierCVE-2024-20429Jul 17, 2024 · A vulnerability in the web-based management interface of Cisco AsyncOS for Secure Email Gateway could allow an authenticated, remote attacke
    28Monitor
  • ← EarlierCVE-2024-20435Jul 17, 2024 · A vulnerability in the CLI of Cisco AsyncOS for Secure Web Appliance could allow an authenticated, local attacker to execute arbitrary comma
    31Monitor
  • Later →CVE-2022-20871Nov 15, 2024 · Cisco Secure Web Appliance Privilege Escalation Vulnerability
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records