CVE-2026-8451: high-severity vulnerability in NetScaler ADC
Insufficient input validation leading to memory overread
Published
63Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck and has a public proof of concept.
ssvc Actcvss 8.8epss 0.5%
from disclosure to weapon0 days
Published on NVDJun 30
1st PoCJun 30
VulnCheck+1d
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
yesVulnCheck
8 public exploit(s)
Insufficient input validation in NetScaler ADC and NetScaler Gateway leading to memory overread if NetScaler ADC or NetScaler Gateway is configured as a SAML IDP
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
public PoCs found — 8
githubgithub.com/watchtowrlabs/watchTowr-vs-Netscaler-CVE-2026-8451★ 13githubgithub.com/amnsecurity/CVE-2026-8451-CitrixBleed★ 2githubgithub.com/derekpreston81/CVE_ADC_IOC_2026★ 2githubgithub.com/0xBlackash/CVE-2026-8451★ 1githubgithub.com/attarwahyup/Netscaler-CVE-2026-8451★ 0vulncheckvulncheck.com/xdb/b8ec00f14209unverifiedvulncheckvulncheck.com/xdb/b207c50beab2unverifiedvulncheckvulncheck.com/xdb/c8884e9be221unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — NetScaler ADC
In the same product, most dangerous first.
CVE-2025-5777CRITICALNetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overreadEPSS 100.0%KEVCVE-2026-19490CRITICALNetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490EPSS 23.2%KEVCVE-2025-7775CRITICALMemory overflow vulnerability leading to Remote Code Execution and/or Denial of ServiceEPSS 20.3%KEVCVE-2025-6543CRITICALMemory overflow vulnerability leading to unintended control flow and Denial of ServiceEPSS 10.6%KEVCVE-2026-3055CRITICALInsufficient input validation leading to memory overreadEPSS 4.0%KEVCVE-2026-8452HIGHMemory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of ServiceEPSS 1.0%KEV