Evolved Programmable Network ManagerApplication · Cisco
CVE-2021-34784
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 · uneditedA vulnerability in the web-based management interface of Cisco Prime Infrastructure (PI) and Cisco Evolved Programmable Network Manager (EPNM) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the web-based management interface of an affected device. This vulnerability exists because the web-based management interface does not properly validate user-supplied 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 confidenceThis is a stored cross-site scripting (XSS) vulnerability in Cisco Prime Infrastructure (PI) and Cisco Evolved Programmable Network Manager (EPNM) web-based management interfaces. The flaw stems from improper validation of user-supplied input, allowing an authenticated attacker to inject malicious scripts that execute in the context of other users' sessions when they click a crafted link.
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
Evolved Programmable Network ManagerApplication
< 5.1.2
Prime InfrastructureApplication
< 3.10CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify installed productDetermine whether Cisco Prime Infrastructure or Cisco Evolved Programmable Network Manager is deployed in your environment. Check running services, installed packages, or consult your asset inventory for these products.Affected if Neither product is present - not applicable. Either product is present - proceed to version check.
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Check EPNM versionAccess the EPNM web interface or use the command-line interface (typically via admin credentials) to retrieve the installed version. Common methods include logging into the management console and navigating to the About or Version section, or running 'show version' via CLI if available.Affected if Version is lower than 5.1.2 - potentially affected and should be investigated further.
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Check Prime Infrastructure versionAccess the PI web interface or use the command-line interface to retrieve the installed version. This is typically found in the administration or system settings area of the web UI, or via CLI with appropriate admin credentials.Affected if Version is lower than 3.10 - potentially affected and should be investigated further.
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Verify web management interface is accessibleConfirm that the web-based management interface for the installed product is enabled and network-accessible. Check that HTTP/HTTPS ports for the management interface are open and responding.Affected if Web interface is not exposed or is disabled - exploitation is not possible in this configuration.
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Review for unauthorized content or scriptsExamine the web application for unexpected or malicious stored scripts, particularly in areas where user input is stored and displayed (such as device names, descriptions, configuration templates, or custom scripts). Audit user-created entries in the management interface for suspicious script tags or JavaScript code.Affected if Malicious scripts are found stored in the application - indicates potential exploitation.
Your environment is affected if either Cisco Prime Infrastructure (version below 3.10) or Cisco Evolved Programmable Network Manager (version below 5.1.2) is installed with the web-based management interface enabled and accessible.
Generated from the published advisory. Verify against your own configuration.
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 · scoped3.105.1.2
Apply the Cisco patch when available. Users should avoid clicking untrusted links. Implement Content Security Policy (CSP) headers as a defense-in-depth measure to mitigate XSS impact.
EPNM: 5.1.2 or later; PI: 3.10 or later
- Upgrade Cisco Evolved Programmable Network Manager (EPNM) to version 5.1.2 or later
- Upgrade Cisco Prime Infrastructure (PI) to version 3.10 or later
- After upgrading, verify the XSS vulnerability is remediated by testing the web-based management interface with the Cisco published remediation validation steps
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Evolved Programmable Network Manager
Scoped from the published advisory
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,392.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34784 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-34784 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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