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ExploitedIn CISA KEVFix available

CVE-2026-88771

Exploitation confirmed. First attested on 2026-09-27 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · previdian, GCVE · shadowserver.

  • Published2026-09-27
  • Fixed in14.1-73.37 · 13.1.37.279 · 13.1-64.23
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

Timeline

dates in UTC
  1. 2026-09-27Added to the CISA KEV catalogCISA KEV
  2. 2026-09-27Listed as exploited by GCVEGCVE
  3. 2026-09-27Exploitation first reportedCISA KEV
  4. 2026-09-2717:16CVE publishedNVD
  5. 2026-09-2812:43SSVC exploitation set to activeCISA-ADP
  6. 2026-10-2523:12EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-11-13 21:37 UTC
Indicators tagged with this CVE, per day20 indicators over 7 days
13
IndicatorSeen
entretiensol.com22 h ago
270818363029321786e16e2102c550a1edc7bd6fde172ed6c620ad1958c36ac822 h ago
ed082f744f035035900f67edf438f2f7d0528ac501234f63d476d65273cdb9a122 h ago
73b74309f4728d169cc9edfb2767c5aadd75d39b62de93c935a86c777d2646bc22 h ago
57f9f30c50240fd48d761de7961a430cdebf2c084a36bc76d376a1ce8e6dfa9d22 h ago
5ea5ea61e9062822bee3f66ef5ff47c217178d9e31936ad6daf10c5dfae44d1222 h ago
927c7fbef2e620c1ce482c3ed67ebf53da97693c1d6c7552c77aec84ba982cf822 h ago
7add390ceee4a1373211b3e340451b34f08965fc4d805f94c9b8cebdc077577422 h ago
9c7bf01d2c2cb31a3609d27c1bc9abc60d86e37b7f9908547e0c75fb18b99aab22 h ago
c2f5532f3209dce0bd30ead47a2616a74ce8170324ef68dfd59acac3f5f1da3422 h ago
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-88771?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-88771?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-73.3714.1-73.37
13.1≥ 13.1, < 13.1.37.27913.1.37.279
13.1≥ 13.1, < 13.1-64.2313.1-64.23
14.1≥ 14.1-66.68, ≤ 14.1-73.37no fix published
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-73.3714.1-73.37
13.1≥ 13.1, < 13.1-64.2313.1-64.23

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As NetScaler, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Citrix NetScaler ADCother versions: not affected
    Affected
    • < 14.1-73.37fixed in 14.1-73.37patch
    • < 13.1-64.23fixed in 13.1-64.23patch
    • < 14.1-73.37 FIPSfixed in 14.1-73.37 FIPSpatch
    • < 13.1.37.279 FIPS and NDcPPfixed in 13.1.37.279 FIPS and NDcPPpatch
  • Citrix NetScaler Gatewayother versions: not affected
    Affected
    • < 14.1-73.37fixed in 14.1-73.37patch
    • < 13.1-64.23fixed in 13.1-64.23patch

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-27

Fix

  1. Update Citrix NetScaler ADC to 14.1-73.37 · 13.1.37.279 · 13.1-64.23
  2. CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-09-30

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/freebsd/http/citrix_netscaler_cve_2026_88771rank: normalModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-09-27
Patch Due Date
2026-09-30
Ransomware Use
Unknown
Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-09-27
Last Modified
2026-09-28
NVD status
Analyzed
GitHub Advisory
GHSA-mx58-p288-86qp

Frequently asked questions

What is CVE-2026-88771?

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

Is CVE-2026-88771 actively exploited?

Yes. CVE-2026-88771 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-09-30.

What is the CVSS score for CVE-2026-88771?

CVE-2026-88771 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record