CVE-2020-0645
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request...
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.
- Record
CVE-2020-0645- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.
- Record
CVE-2020-0645- Updated
- 2026-11-02
EUVDEUVD-2020-2139 No score
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.
- Record
EUVD-2020-2139- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j5hm-cjrm-f26f No score
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request...
A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.
- Record
GHSA-j5hm-cjrm-f26f- Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
- microsoft windows
- microsoft windows 10 version 1903 for 32-bit systems
- microsoft windows 10 version 1903 for arm64-based systems
- microsoft windows 10 version 1903 for x64-based systems
- microsoft windows 10 version 1909 for 32-bit systems
- microsoft windows 10 version 1909 for arm64-based systems
- microsoft windows 10 version 1909 for x64-based systems
- microsoft windows server
- microsoft windows server, version 1903 (server core installation)
- microsoft windows server, version 1909 (server core installation)
- microsoft windows 10
- microsoft windows 7
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-0645 is a high vulnerability (CVSS 7.5) in Microsoft Windows, published March 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.90%, the 90th percentile. No source names a fixed version.