CVE-2019-19781 (GCVE-0-2019-19781)
Vulnerability from cvelistv5 – Published: 2019-12-27 13:06 – Updated: 2026-08-12 03:55Summary
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2020-01-08 00:00 UTC
CWE
- n/a
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://support.citrix.com/article/CTX267027 | x_refsource_CONFIRM |
| https://www.kb.cert.org/vuls/id/619785 | third-party-advisoryx_refsource_CERT-VN |
| https://twitter.com/bad_packets/status/1215431625… | x_refsource_MISC |
| https://badpackets.net/over-25000-citrix-netscale… | x_refsource_MISC |
| https://forms.gle/eDf3DXZAv96oosfj6 | x_refsource_MISC |
| http://packetstormsecurity.com/files/155904/Citri… | x_refsource_MISC |
| http://packetstormsecurity.com/files/155930/Citri… | x_refsource_MISC |
| http://packetstormsecurity.com/files/155905/Citri… | x_refsource_MISC |
| http://packetstormsecurity.com/files/155947/Citri… | x_refsource_MISC |
| http://packetstormsecurity.com/files/155972/Citri… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f4fe6680-3c0a-4afb-a69d-ab1c3d5cf4e0
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability | Affected: Citrix / Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance | Description: Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an unspecified vulnerability that could allow an unauthenticated attacker to perform code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2019-19781
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-22 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance |
| Due Date | 2022-05-03 |
| Date Added | 2021-11-03 |
| Vendorproject | Citrix |
| Vulnerabilityname | Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 12:28 UTC
| Updated: 2026-11-04 13:34 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9be2e414-4d33-4a6c-afc9-50ad8392de68
Exploited: Yes
Characteristics
Severity:
98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-11-12
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Citrix / Application Delivery Controller | Class: app-delivery-controller | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-11-12: 399
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 13 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | app-delivery-controller |
| 7D Avg | 19 |
| Vendor | Citrix |
| 30D Avg | 13 |
| 90D Avg | 13 |
| Product | Application Delivery Controller |
| Cisa Kev | yes |
| Connections | 399 |
| Observation Date | 2026-11-12 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 9.8 |
| Vulnerability Severity | Critical |
References
Created: 2026-06-30 09:23 UTC
| Updated: 2026-11-14 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6fa3d275-8bfa-4fd7-9a50-cd74f71f2c0d
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal. | Affected: Citrix / Application Delivery Controller and Gateway | CVSS: 9.8 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal. |
| Vendor | Citrix |
| Product | Application Delivery Controller and Gateway |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | 0.99999 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.99998 |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:04 UTC
| Updated: 2026-07-10 06:14 UTC
SiberKapan
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5849e10f-cc9e-4dea-9633-3a3732e76d1f
Exploited: Yes
Timestamps
First Seen: 2026-09-16
Last Seen: 2026-09-16
Scope
Observation Regions:
Western Asia
Asset Exposure: ['internet-facing']
Notes: Observed on SiberKapan honeypot and production web server sensors located in Turkey. Regions reflect sensor coverage, not global exclusivity.
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 80%
Source: SiberKapan
Details
| Description | Citrix ADC path traversal |
|---|---|
| Attempts 90D | 1 |
| Sensor Types | honeypot |
| Signature Strength | strong |
| Distinct Source Ips 90D | 1 |
| Successful Exploitation | False |
References
Created: 2026-11-07 18:06 UTC
| Updated: 2026-11-07 18:06 UTC
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.