Enterprise Nfv Infrastructure SoftwareApplication · Cisco
CVE-2021-1127
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 Enterprise NFV Infrastructure Software (NFVIS) could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface. The vulnerability is due to improper input validation of log file content stored on the affected device. An attacker could exploit this vulnerability by modifying a log file with malicious code and getting a user to view the modified log file. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or to 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 · moderate confidenceStored XSS vulnerability in Cisco NFVIS web-based management interface where an authenticated attacker can inject malicious script code into log files. When users view these modified log files through the interface, the embedded JavaScript executes in their browser context, allowing session hijacking or information theft.
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
Enterprise Nfv Infrastructure SoftwareApplication
< 4.4.1CVSS 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.
-
Identify NFVIS installation and versionAccess the Cisco NFVIS CLI or web management interface and locate the software version information, typically found in the system dashboard or about pageAffected if The installed version is any release prior to 4.4.1 (e.g., 4.4.0, 4.3.x, 4.2.x, etc.)
-
Confirm web-based management interface is enabledVerify that the NFVIS web-based management interface (HTTP/HTTPS) is actively running and accessible. Check via CLI command 'show web-interface' or similar administrative status commandsAffected if The web management interface is enabled and reachable
-
Verify log viewing functionality is accessibleNavigate to the log viewing section of the NFVIS web interface (typically under Administration > Logs or Monitoring > Logs) to confirm the feature is present and accessible to usersAffected if Users can view log files through the web interface
-
Confirm authenticated user access to log injection pointReview user accounts and privileges to determine if regular authenticated users have the ability to generate or influence log entries that appear in the web-accessible log viewerAffected if Authenticated users (other than administrators) can generate log entries that are displayed in the web interface
You are affected if Cisco NFVIS is running a version prior to 4.4.1 and the web-based management interface with log viewing capabilities is enabled and accessible to authenticated users
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.
From vendor data4.4.1
Apply Cisco's patch for CVE-2021-1127 when available. As interim measure, restrict access to log viewing functions to only highly trusted users and monitor for unauthorized log modifications.
Fix this in Enterprise Nfv Infrastructure Software
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 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 $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1127 — 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-2021-1127 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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