Citrix Session Recording Deserialization of Untrusted Data Vulnerability
Limited remote code execution with privilege of a NetworkService Account access in Citrix Session Recording if the attacker is an authenticated user on the same intranet as the session recording server
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)25 Aug 2025
- Exploited in EUVD (ENISA)25 Aug 2025
- Used by ransomwareno
- EPSS above 10 %21.1%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
- 2407 Current Release <24.5.200.8
- 2203 LTSR <CU5 hotfix 22.03.5100.11
- 1912 LTSR <CU9 hotfix 19.12.9100.6
- 2402 LTSR <CU1 hotfix 24.02.1200.16
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
-
EPSS peak: 21.1%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-88779Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability6.2 · Actively exploited
- CVE-2026-88772Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability8.5 · Actively exploited
- CVE-2026-88771Citrix NetScaler Improper Input Validation Vulnerability8.7 · Actively exploited
- CVE-2026-19490Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability7.1 · Actively exploited
- CVE-2026-8452Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability5.4 · Actively exploited
- CVE-2026-3055Citrix NetScaler Out-of-Bounds Read Vulnerability8.9 · Background exploitation