How severe is CVE-2010-2991?

CVE-2010-2991 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2010-2991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-2991?

CVE-2010-2991 primarily affects Citrix Online Plug-in For Windows For Xenapp & Xendesktop. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-2991?

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-2010-2991 published?

CVE-2010-2991 was published on 2010-08-11 and last updated on 2026-06-16.

CVE-2010-2991

CVE-2010-2991 is a critical-severity vulnerability in Citrix Online Plug-in For Windows For Xenapp & Xendesktop with a CVSS 2.0 base score of 9.3. 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-94.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Citrix Online Plug-in For Windows For Xenapp & Xendesktop
Published: 2010-08-11
Last modified: 2026-06-16

Description

The IICAClient interface in the ICAClient library in the ICA Client ActiveX Object (aka ICO) component in Citrix Online Plug-in for Windows for XenApp & XenDesktop before 12.0.3 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted HTML document that triggers the reading of a .ICA file.

Frequently asked questions

What is CVE-2010-2991?: The IICAClient interface in the ICAClient library in the ICA Client ActiveX Object (aka ICO) component in Citrix Online Plug-in for Windows for XenApp & XenDesktop before 12.0.3 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted HTML document that triggers the reading of a .ICA file.
How severe is CVE-2010-2991?: CVE-2010-2991 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2010-2991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-2991?: CVE-2010-2991 primarily affects Citrix Online Plug-in For Windows For Xenapp & Xendesktop. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-2991?: 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-2010-2991 published?: CVE-2010-2991 was published on 2010-08-11 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:citrix:online_plug-in_for_windows_for_xenapp_\&_xendesktop:*:*:*:*:*:*:*:*
cpe:2.3:a:citrix:online_plug-in_for_windows_for_xenapp_\&_xendesktop:11.1:*:*:*:*:*:*:*

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