How severe is CVE-2016-6493?

CVE-2016-6493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-6493 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6493?

CVE-2016-6493 primarily affects Citrix Xenapp. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6493?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-6493 published?

CVE-2016-6493 was published on 2016-08-19 and last updated on 2026-06-17.

CVE-2016-6493

CVE-2016-6493 is a critical-severity vulnerability in Citrix Xenapp with a CVSS 3.x base score of 9.8. 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-254.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Citrix Xenapp
Published: 2016-08-19
Last modified: 2026-06-17

Description

Citrix XenApp 6.x before 6.5 HRP07 and 7.x before 7.9 and Citrix XenDesktop before 7.9 might allow attackers to weaken an unspecified security mitigation via vectors related to memory permission.

Frequently asked questions

What is CVE-2016-6493?: Citrix XenApp 6.x before 6.5 HRP07 and 7.x before 7.9 and Citrix XenDesktop before 7.9 might allow attackers to weaken an unspecified security mitigation via vectors related to memory permission.
How severe is CVE-2016-6493?: CVE-2016-6493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-6493 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6493?: CVE-2016-6493 primarily affects Citrix Xenapp. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6493?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-6493 published?: CVE-2016-6493 was published on 2016-08-19 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:citrix:xenapp:6.0.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:6.5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.0.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.6.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenapp:7.8.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xendesktop:*:*:*:*:*:*:*:*

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