CVE-2019-12986
Confirmed PUBLISHEDCitrix 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 2 of 6).
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
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 2 of 6).
- CVE Published
- Jul 16, 2019
- Exploitation Reported
- Jun 13, 2025
- CVSS
- 9.8 Critical
- EPSS
- 39.5%
CVE References
- 109133 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/109133
- tenable.com/security/research/tra-2019-31 tenable.com · CVE Record https://www.tenable.com/security/research/tra-2019-31
- support.citrix.com/article/CTX251987 support.citrix.com · CVE Record https://support.citrix.com/article/CTX251987
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-06-13 00:00 UTC |
| KEVIntel | 2026-07-30 14:50 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 4
- Unique Attacker IPs
- 3
- Attacker Countries
- 🇯🇵 🇳🇱 🇺🇸
- Sensors Observed
- 4
Exploitation Attempts Over the Last 33 Days
First observed (all time) 2026-07-03 04:21 UTC · Last observed 2026-07-30 15:23 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request targets
- 1
- Distinct User-Agents
- 4
The specific request targets and User-Agents attackers are using are available on Pro and Enterprise plans.
Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-12986.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:C/I:C/A:C
Exploitation Status
Exploited in the wild
Recorded 2025-06-13 00:00:00 UTC · The Shadowserver
Active exploitation observed
Recorded 2026-07-03 04:21:01 UTC · KEVIntel sensor
Proof of concept available
Recorded 2026-06-12 14:20:12 UTC · Nuclei Templates
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Scanner Integrations
Nuclei, Metasploit, and other scanner references for this CVE are listed on the Detection tab.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
04:21 UTC about 1 month ago04:21 UTC · about 1 month ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
04:21 UTC about 1 month ago04:21 UTC · about 1 month ago
Indicators of compromise added (8)
Indicators of compromise recorded
-
14:20 UTC about 2 months ago14:20 UTC · about 2 months ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:00 UTC over 1 year ago00:00 UTC · over 1 year ago
Nuclei template available
Scanner coverage available
-
17:47 UTC about 7 years ago17:47 UTC · about 7 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC about 7 years ago00:00 UTC · about 7 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2019-12986
{
"cve_id": "CVE-2019-12986",
"title": "Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 ...",
"affected_vendor": "Citrix",
"affected_product": "SD-WAN",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.39544,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}