NetScaler ADC: Files or Directories Accessible to External Parties
CVE-2024-8535 is a high-severity files or directories accessible to external parties vulnerability in NetScaler ADC from NetScaler, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 29.72, 55.34, 37.207 as the first without the flaw, so updating NetScaler ADC to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.42% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update NetScaler ADC to 29.72 or 55.34 or 37.207 or 55.321, whichever matches your release line, or a later version.
- Update NetScaler Gateway to 29.72 or 55.34 or 37.207 or 55.321, whichever matches your release line, or a later version.
- Update adc to 29.72 or 55.34 or 37.207 or 55.321, whichever matches your release line, or a later version.
- Read the advisory on support.citrix.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| NetScaler | NetScaler ADC | 14.1 up to, but not including, 29.72; 13.1 up to, but not including, 55.34; 13.1 FIPS up to, but not including, 37.207; 12.1-FIPS up to, but not including, 55.321; 12.1-NDcPP up to, but not including, 55.321 | 29.72, 55.34, 37.207, 55.321 |
| NetScaler | NetScaler Gateway | 14.1 up to, but not including, 29.72; 13.1 up to, but not including, 55.34; 13.1-FIPS up to, but not including, 37.207; 12.1-FIPS up to, but not including, 55.321; 12.1-NDcPP up to, but not including, 55.321 | 29.72, 55.34, 37.207, 55.321 |
| Netscaler | adc | 14.1 up to, but not including, 29.72; 13.1 up to, but not including, 55.34; 13.1fips up to, but not including, 37.207; 12.1-fips up to, but not including, 55.321; 12.1-ndcpp up to, but not including, 55.321 | 29.72, 55.34, 37.207, 55.321 |
| Netscaler | gateway | 14.1 up to, but not including, 29.72; 13.1 up to, but not including, 55.34; 13.1fips up to, but not including, 37.207; 12.1-fips up to, but not including, 55.321; 12.1-ndcpp up to, but not including, 55.321 | 29.72, 55.34, 37.207, 55.321 |
| Citrix | Netscaler Application Delivery Controller | 12.1 up to, but not including, 12.1-55.321; 12.1 up to, but not including, 13.1-55.34; 13.1 up to, but not including, 13.1-37.207; 14.1 up to, but not including, 14.1-29.72 | 12.1-55.321, 13.1-55.34, 13.1-37.207, 14.1-29.72 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 5.8 | Medium | CNA (citrix.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
Authenticated user can access unintended user capabilities in NetScaler ADC and NetScaler Gateway if the appliance must be configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) with KCDAccount configuration for Kerberos SSO to access backend resources OR the appliance must be configured as an Auth Server (AAA Vserver) with KCDAccount configuration for Kerberos SSO to access backend resources
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Files or Directories Accessible to External Parties
The product makes files or directories accessible to unauthorized actors, even though they should not be.
How developers prevent this class of flaw
- When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to disable public access.
More Files or Directories Accessible to External Parties vulnerabilities (CWE-552)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Recent Files or Directories Accessible to External Parties vulnerabilities
- 8.6 High severity
- 7.2 High severity
- 7.5 High severity
- 9.2 Critical severity
- 9.8 Critical severity
- 8.8 High severity
Spotted an error? Tell us.