How severe is CVE-2017-17549?

CVE-2017-17549 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-17549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17549?

CVE-2017-17549 primarily affects Citrix Application Delivery Controller Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-17549?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-17549 published?

CVE-2017-17549 was published on 2017-12-13 and last updated on 2026-06-17.

CVE-2017-17549

CVE-2017-17549 is a medium-severity vulnerability in Citrix Application Delivery Controller Firmware with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Citrix Application Delivery Controller Firmware
Published: 2017-12-13
Last modified: 2026-06-17

Description

Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.

Frequently asked questions

What is CVE-2017-17549?: Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.
How severe is CVE-2017-17549?: CVE-2017-17549 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-17549 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17549?: CVE-2017-17549 primarily affects Citrix Application Delivery Controller Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-17549?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-17549 published?: CVE-2017-17549 was published on 2017-12-13 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:citrix:application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*
cpe:2.3:o:citrix:application_delivery_controller_firmware:11.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:application_delivery_controller_firmware:11.1:*:*:*:*:*:*:*
cpe:2.3:o:citrix:application_delivery_controller_firmware:12.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:11.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:11.1:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:12.0:*:*:*:*:*:*:*

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