synced 8 MIN AGO
01 Record

CVE-2026-88778

TCP Initial Sequence Number (ISN) prediction

HighPUBLISHEDCNA: NetScaler
CNA base score8.8 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L

02 Description

TCP Initial Sequence Number (ISN) prediction

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.69% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 52.6% of scored records. A rank, not a probability.
NVD base score
8.8 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L/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
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-29.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-27 16:43Z1 MO AGO
Last updated
2026-09-29 16:35Z29 DAYS AGO
Reserved
2026-09-10
Assigning CNA
NetScaler
Record state
PUBLISHED
Severity
High (CVSS 8.8)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L
Weaknesses
  • CWE-342Predictable Exact Value from Previous ValuesBase
Data version
5.2
Document digest
b4a7789d84e999ba0c9cd9c1c80acdd3e159acb78f95f10fdad4abd7d3ea18ef

05 Affected products

VendorProductVersionsPlatforms
Citrix NetScalerADC0 to < 14.1-73.37, 0 to < 13.1-64.23, 0 to < 14.1-73.37 FIPS, 0 to < 13.1.37.279 FIPS and NDcPP—
Citrix NetScalerGateway0 to < 14.1-73.37, 0 to < 13.1-64.23—

06 References