CVE-2008-5121

CVE-2008-5121 is a high-severity vulnerability in Citrix Deterministic Network Enhancer with a CVSS 2.0 base score of 7.2. 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-264.

Key facts

• Severity: High (CVSS 2.0 base score 7.2)
• EPSS exploit prediction: 1% (62nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-264
• Affected product: Citrix Deterministic Network Enhancer
• Published: 2008-11-18
• Last modified: 2026-06-16

Description

dne2000.sys in Citrix Deterministic Network Enhancer (DNE) 2.21.7.233 through 3.21.7.17464, as used in (1) Cisco VPN Client, (2) Blue Coat WinProxy, and (3) SafeNet SoftRemote and HighAssurance Remote, allows local users to gain privileges via a crafted DNE_IOCTL DeviceIoControl request to the \\.\DNE device interface.

Frequently asked questions

What is CVE-2008-5121?

dne2000.sys in Citrix Deterministic Network Enhancer (DNE) 2.21.7.233 through 3.21.7.17464, as used in (1) Cisco VPN Client, (2) Blue Coat WinProxy, and (3) SafeNet SoftRemote and HighAssurance Remote, allows local users to gain privileges via a crafted DNE_IOCTL DeviceIoControl request to the \\.\DNE device interface.

How severe is CVE-2008-5121?

CVE-2008-5121 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2008-5121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-5121?

CVE-2008-5121 primarily affects Citrix Deterministic Network Enhancer. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-5121?

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

When was CVE-2008-5121 published?

CVE-2008-5121 was published on 2008-11-18 and last updated on 2026-06-16.

References

• http://secunia.com/advisories/30728
• http://secunia.com/advisories/30744
• http://secunia.com/advisories/30747
• http://secunia.com/advisories/30753
• http://securityreason.com/securityalert/4600
• http://support.citrix.com/article/CTX117751
• http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsm25860
• http://www.digit-labs.org/files/exploits/dne2000-call.c
• http://www.kb.cert.org/vuls/id/858993
• http://www.securityfocus.com/bid/29772
• http://www.vupen.com/english/advisories/2008/1865
• http://www.vupen.com/english/advisories/2008/1866
• http://www.vupen.com/english/advisories/2008/1867
• http://www.vupen.com/english/advisories/2008/1868
• https://exchange.xforce.ibmcloud.com/vulnerabilities/43153
• https://www.exploit-db.com/exploits/5837

Affected products (2)

• cpe:2.3:a:citrix:deterministic_network_enhancer:2.21.7.223:*:*:*:*:*:*:*
• cpe:2.3:a:citrix:deterministic_network_enhancer:3.21.7.17464:*:*:*:*:*:*:*

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