CVE-2023-6549
Citrix — Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
Citrix · CWE-119 · in CISA KEV since 2024-01-17
EVRS 75 of 100 Urgent
Patch This Cycle
Rank 713 of 2,954 tracked
Raised to the floor for a confirmed exploited vulnerability.
Why it scores 75
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and an EPSS probability of 0.576.
- CISA KEVApplied
- RansomwareDid not apply
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
- support.citrix.com/…/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549
- nvd.nist.gov/…/CVE-2023-6549
Fixed in
netscaler application delivery controller: update to 12.1-55.302 or later | netscaler application delivery controller: update to 13.0-92.21 or later | netscaler application delivery controller: update to 13.1-37.176 or later | netscaler application delivery controller: update to 13.1-51.15 or later | netscaler application delivery controller: update to 14.1-12.35 or later | netscaler gateway: update to 13.0-92.21 or later
Affected versions
- netscaler application delivery controller
>= 12.1 < 12.1-55.302>= 13.0 < 13.0-92.21>= 13.1 < 13.1-37.176>= 13.1 < 13.1-51.15>= 14.1 < 14.1-12.35 - netscaler gateway
>= 13.0 < 13.0-92.21>= 13.1 < 13.1-51.15>= 14.1 < 14.1-12.35
Remediation
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 7.5 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.576 (99.09th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Unknown or none | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2024-02-07 · KEV since 2024 · listed over a year | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | None known | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 8.2 (v3.1), assigned by Citrix. | Listed | ENISA EUVD |
Description
NVDImproper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read
What CISA says to do