CVE-2017-5933

low-risk

Published 2017-02-08

Citrix NetScaler ADC and NetScaler Gateway 10.5 before Build 65.11, 11.0 before Build 69.12/69.123, and 11.1 before Build 51.21 randomly generates GCM nonces, which makes it marginally easier for remote attackers to obtain the GCM authentication key and spoof data by leveraging a reused nonce in a session and a "forbidden attack," a similar issue to CVE-2016-0270.

Do I need to act?

0.94% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.9/10 Medium

NETWORK / HIGH complexity

Affected Products (1)

Netscaler Application Delivery Controller Firmware

Affected Vendors

Citrix

References (6)

Third Party Advisory http://www.securityfocus.com/bid/96151

Third Party Advisory https://github.com/nonce-disrespect/nonce-disrespect

Vendor Advisory https://support.citrix.com/article/CTX220329

Third Party Advisory http://www.securityfocus.com/bid/96151

Third Party Advisory https://github.com/nonce-disrespect/nonce-disrespect

Vendor Advisory https://support.citrix.com/article/CTX220329

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low-risk

Severity 18/34 · Moderate

Exploitability 3/34 · Minimal

Exposure 5/34 · Minimal