Known exploited vulnerability
CVE-2023-6549
The short answer
CVE-2023-6549 affects Cloud Software Group NetScaler ADC and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2024-01-17: attackers are using it, so patch it first.
What it is
Improper 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
Weakness: CWE-119.
Severity
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploited (CISA KEV)
Yes, since Jan 17, 2024
Federal due date Feb 7, 2024
EPSS, next 30 days
58%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
NetScaler ADC. NVD's record lists the exact affected versions.
References
- support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549 Vendor Advisory
- support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549 Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-6549 US Government Resource
Questions
Is CVE-2023-6549 being exploited?
Yes. CISA added CVE-2023-6549 to its Known Exploited Vulnerabilities catalog on 2024-01-17, with a federal remediation due date of 2024-02-07.
How do I fix CVE-2023-6549?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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