HOMEVULNERABILITIESCVE-2008-5121
HIGHPOC

CVE-2008-5121

CWE-264Published: November 18, 2008· Updated: Jun 16, 2026

7.2
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2008-5121 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2008-5121. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityC
IntegrityC
AvailabilityC
AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors & Products

bluecoat1 product(s)
winproxy
Cisco1 product(s)
vpn client
citrix1 product(s)
deterministic network enhancer
safenet2 product(s)
highassurance remotesoftremote vpn client
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://secunia.com/advisories/30728
ADVISORYhttp://secunia.com/advisories/30744
ADVISORYhttp://secunia.com/advisories/30747
ADVISORYhttp://secunia.com/advisories/30728
ADVISORYhttp://secunia.com/advisories/30744
ADVISORYhttp://secunia.com/advisories/30747

All References (32)

→
http://secunia.com/advisories/30728Vendor Advisory
→
http://secunia.com/advisories/30744Vendor Advisory
→
http://secunia.com/advisories/30747Vendor Advisory
→
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/858993US Government Resource
→
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

Quick Facts

CVE IDCVE-2008-5121
CVSS Score7.2 / 10
SeverityHIGH
WeaknessCWE-264
CISA KEVNo
ExploitPOC
Affected4 vendor(s)
PublishedNov 18, 2008

Related CVEs (CWE-264)

CVE-2007-2435
10.0
CVE-2008-0375
10.0
CVE-2008-7173
10.0
CVE-2006-0697
10.0
CVE-2003-1495
10.0
CVE-2007-6319
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2008-5121 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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