CVE-2020-3355Network attack vector

Stored XSS via insufficient field validation

Published Jun 18, 2020 · Updated Nov 15, 2024

Stored XSS in Cisco Data Center Network Manager 11.3(1) and earlier allows remote authenticated users to run script in another user's browser. The web interface stores data from an unspecified field without sufficient validation and later renders it as executable browser content. Administrative credentials are required to insert the payload, and a user must view the affected interface before browser data can be read or altered.

CVSS severity4.8
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Cisco Data Center Network Manager 11.3(1) and earlier allows remote authenticated users to run script in another user's browser. The web interface stores data from an unspecified field without sufficient validation and later renders it as executable browser content. Administrative credentials are required to insert the payload, and a user must view the affected interface before browser data can be read or altered.

The record

CVE
CVE-2020-3355
Published
Jun 18, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Data Center Network Manager
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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 privilegesadmin

What is affected?

ClamAV · Cisco Data Center Network Managerversion=n/a

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8Cisco Systems, Inc.CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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