CVE-2000-0453
Xfree86 Project X11r6 — NVD-CWE-Other
EPSS 4.0%
- Published: 2000-05-18T04:00:00.000
- Last modified: 2025-04-03T01:03:51.193
- Vendors: Xfree86 Project
- Products: X11r6
- CWE: NVD-CWE-Other
XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000.
Related CVE by CWE
No related CWE found.
Top CVE for Vendor
- CVE-1999-0241 (no score)
- CVE-1999-0126 (no score)
- CVE-1999-0433 (no score)
- CVE-2000-0285 (no score)
- CVE-2000-0453 (no score)
Recently Exploited Similar Vulnerabilities
No recent KEV-listed items for this vendor/product.
How to fix CVE-2000-0453
CVE-2000-0453 is a unknown severity vulnerability affecting Xfree86 Project X11r6.
Description: XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000. Related CVE by CWENo related CWE found.Top CVE for VendorCVE-1999-0241 (no score)CVE-1999-0126 (no score)CVE-1999-0433 (no score)CVE-2000-0285 (no score)CVE-2000-0453 (no score)Recently Exploited Similar VulnerabilitiesNo recent KEV-listed items […]
Exploit Difficulty: HARD
⏱️ Time to exploit: > 4 hours
🛠️ Required skills: Advanced security expertise
💰 Public exploits: Rare or not public
How to Fix:
- Check if you're running X11r6
- Update to the latest patched version
- If patching is not immediately possible: restrict network exposure, apply least-privilege access
- Test the fix in a staging environment first
- Review logs for signs of exploitation
- Monitor for IOCs (Indicators of Compromise)
- Enable automatic security updates
- Set up vulnerability monitoring
- Review and harden security configurations
Description: XFree86 3.3.x and 4.0 allows a user to cause a denial of service via a negative counter value in a malformed TCP packet that is sent to port 6000. Related CVE by CWENo related CWE found.Top CVE for VendorCVE-1999-0241 (no score)CVE-1999-0126 (no score)CVE-1999-0433 (no score)CVE-2000-0285 (no score)CVE-2000-0453 (no score)Recently Exploited Similar VulnerabilitiesNo recent KEV-listed items […]
Exploit Difficulty: HARD
⏱️ Time to exploit: > 4 hours
🛠️ Required skills: Advanced security expertise
💰 Public exploits: Rare or not public
How to Fix:
1 Identify affected systems
- Check if you're running X11r6
2 Immediate actions
- Update to the latest patched version
- If patching is not immediately possible: restrict network exposure, apply least-privilege access
3 Verification
- Test the fix in a staging environment first
- Review logs for signs of exploitation
- Monitor for IOCs (Indicators of Compromise)
4 Long-term prevention
- Enable automatic security updates
- Set up vulnerability monitoring
- Review and harden security configurations
CWE: NVD-CWE-Other
Exploit Difficulty Assessment
HARD
Time to Exploit: > 4 hours
Skills Required: Advanced security expertise
Public Exploits: Rare or not public
Vulnerability Timeline
May 18, 2000
Vulnerability Published
CVE details first published to NVD database
Apr 03, 2025
Last Modified
CVE details were updated
Nov 03, 2025
Imported to Database
Added to this CVE tracking system
Detection Rules & IOCs
No specific detection rules generated for this vulnerability type.
- ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2000-012.0.txt []
- http://archives.neohapsis.com/archives/bugtraq/2000-05/0223.html []
- http://www.securityfocus.com/bid/1235 []
- ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2000-012.0.txt []
- http://archives.neohapsis.com/archives/bugtraq/2000-05/0223.html []
- http://www.securityfocus.com/bid/1235 []
No explicit mitigation/advisory links found in references.