CVE-2023-6549: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
First published: Wed Jan 17 2024(Updated: )
Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
Credit: secure@citrix.com secure@citrix.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Citrix NetScaler | ||
| Citrix NetScaler SD-WAN | ||
| Google Chrome | ||
| Citrix NetScaler ADC | >=12.1<12.1-55.302 | |
| Citrix NetScaler ADC | >=12.1<12.1-55.302 | |
| Citrix NetScaler ADC | >=13.0<13.0-92.21 | |
| Citrix NetScaler ADC | >=13.1<13.1-37.176 | |
| Citrix NetScaler ADC | >=13.1<13.1-51.15 | |
| Citrix NetScaler ADC | >=14.1<14.1-12.35 | |
| Citrix Netscaler Gateway Firmware | >=13.0<13.0-92.21 | |
| Citrix Netscaler Gateway Firmware | >=13.1<13.1-51.15 | |
| Citrix Netscaler Gateway Firmware | >=14.1<14.1-12.35 |
Remedy
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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Reference Links
- https://www.theregister.com/2024/01/18/citrix_netscaler_bugs_attacked/
- https://www.bleepingcomputer.com/news/security/citrix-warns-of-new-netscaler-zero-days-exploited-in-attacks/
- https://www.bleepingcomputer.com/news/security/cisa-pushes-federal-agencies-to-patch-citrix-rce-within-a-week/
- https://www.bleepingcomputer.com/news/security/citrix-warns-admins-to-manually-mitigate-putty-ssh-client-bug/
- https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549
- https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549;
- https://nvd.nist.gov/vuln/detail/CVE-2023-6549
Frequently Asked Questions
What is the severity of CVE-2023-6549?
CVE-2023-6549 is classified as a high severity vulnerability due to its potential to cause denial-of-service.
How do I fix CVE-2023-6549?
To mitigate CVE-2023-6549, it's essential to apply the latest patches provided by Citrix for affected NetScaler ADC and Gateway versions.
What systems are affected by CVE-2023-6549?
CVE-2023-6549 affects Citrix NetScaler ADC, NetScaler Gateway, and specific versions of Citrix's Application Delivery Controller.
What type of vulnerability is CVE-2023-6549?
CVE-2023-6549 is a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway or AAA virtual server.
Can CVE-2023-6549 be exploited remotely?
Yes, CVE-2023-6549 can be exploited remotely if the affected configurations are exposed to the internet.
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