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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 15 Apr 2022.
Netscaler Sd WanApplication · Citrix

CVE-2019-12991

HIGH · 8.8 CVSS v3.1 Published 2019-07-16
Fix available
A fix is available. Upgrade to 10.0.8 / 10.2.3 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild High EPSS Public exploit Remotely reachable Zero-click

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
Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 have Improper Input Validation (issue 5 of 6).

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 confidence

Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 contain an improper input validation vulnerability, likely allowing attackers to inject malicious input that could be processed without adequate sanitization, potentially leading to injection attacks or unexpected behavior.

MitigationUpgrade Citrix SD-WAN to version 10.2.3 or later, or NetScaler SD-WAN to version 10.0.8 or later, to remediate this improper input validation vulnerability.

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
Netscaler Sd WanApplication
Affected:>= 10.0.0, < 10.0.8
Sd WanApplication
Affected:>= 10.2.0, < 10.2.3

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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 the SD-WAN product variant
    Access the SD-WAN appliance management interface or CLI and determine if the product is labeled as 'Citrix NetScaler SD-WAN' or 'Citrix SD-WAN'. The product name is typically displayed on the login page or in the system information section.
    Affected if The product is either Citrix NetScaler SD-WAN or Citrix SD-WAN.
  2. Determine the installed software version
    Log into the SD-WAN web management console and navigate to the 'System', 'Statistics', or 'About' section to view the running software version. Alternatively, use the CLI command 'show version' or 'system info' to retrieve the version number.
    Affected if The version displayed is 10.0.x where x is less than 8, or 10.2.x where x is less than 3.
  3. Compare version against affected ranges
    Match the identified version number to the vulnerable ranges: NetScaler SD-WAN versions 10.0.0 through 10.0.7 (any 10.0.x below 10.0.8), and Citrix SD-WAN versions 10.2.0 through 10.2.2 (any 10.2.x below 10.2.3).
    Affected if The installed version falls within 10.0.0 to 10.0.7 or 10.2.0 to 10.2.2.
  4. Verify management interface accessibility
    Check network configuration to determine if the SD-WAN management interface (HTTP/HTTPS on ports 80/443 or the dedicated management port) is reachable from untrusted networks. Review firewall rules, ACLs, and interface bindings.
    Affected if The management interface is accessible from networks outside the trusted administrative zone.

You are affected if your SD-WAN runs Citrix NetScaler SD-WAN version 10.0.x below 10.0.8 or Citrix SD-WAN version 10.2.x below 10.2.3, and the management interface is exposed to network paths where untrusted input could be submitted.

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 10.0.8 / 10.2.3 or later
Fixed in 10.0.810.2.3
Interim mitigation

Upgrade Citrix SD-WAN to version 10.2.3 or later, or NetScaler SD-WAN to version 10.0.8 or later, to remediate this improper input validation vulnerability.

Recommended fix High confidence

Citrix SD-WAN 10.0.8 (for 10.0.x branch) or 10.2.3 (for 10.2.x branch)

  1. 1. Back up current SD-WAN configuration and ensure you have a recovery mechanism
  2. 2. Download the fixed SD-WAN release from Citrix support portal: version 10.0.8 for 10.0.x branch or version 10.2.3 for 10.2.x branch
  3. 3. Plan maintenance window as upgrade may cause brief network interruption
  4. 4. Upload the new firmware/software version to the SD-WAN appliance
  5. 5. Initiate the upgrade following Citrix SD-WAN upgrade procedures
  6. 6. Verify the upgrade completed successfully
  7. 7. Validate that all SD-WAN services are functioning normally post-upgrade
Caveat Review Citrix release notes for any configuration or behavioral changes between your current version and the target fixed version before upgrading

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

Fix this in Netscaler Sd Wan Exploited in the wild — priority engagement
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

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-2019-12991 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