Microsoft Exchange Server 5.5 does not properly handle a MIME header with a blank charset specified, which allows remote attackers to cause a denial of service via a charset="" command, aka the "Malformed MIME Header" vulnerability
Published Jan 22, 2001
5.0
MEDIUMCVSS 2.0
EPSS 14.79%
Description
Microsoft Exchange Server 5.5 does not properly handle a MIME header with a blank charset specified, which allows remote attackers to cause a denial of service via a charset="" command, aka the "Malformed MIME Header" vulnerability.
Affected products
No data.
- 5.5
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 14.79% (0.14786) | 96.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 14.79% (0.14786) | 96.25th | v5 (v2026.06.15) |
| Mar 30, 2025 | 9.99% (0.09991) | 92.31th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.23% (0.07232) | 85.72th | v4 (v2025.03.14) |
| Mar 19, 2025 | 9.99% (0.09991) | 92.06th | v4 (v2025.03.14) |
| Mar 17, 2025 | 8.12% (0.08118) | 91.53th | v4 (v2025.03.14) |
| Dec 17, 2024 | 33.17% (0.33166) | 97.05th | v3 (v2023.03.01) |
| Mar 7, 2023 | 74.15% (0.74152) | 97.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 11.68% (0.11676) | 95.15th | v2 (v2022.01.01) |
| Apr 1, 2022 | 11.68% (0.11676) | 94.76th | v2 (v2022.01.01) |
| Feb 4, 2022 | 11.68% (0.11676) | 88.93th | v2 (v2022.01.01) |
No CWE recorded.
References (3)
- http://www.securityfocus.com/bid/1869 vdb-entryx_refsource_BIDExploitPatchThird Party AdvisoryVDB EntryVendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-082 vendor-advisoryx_refsource_MSPatchVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5448 vdb-entryx_refsource_XFVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/1869 | vdb-entryx_refsource_BIDExploitPatchThird Party AdvisoryVDB EntryVendor Advisory | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-082 | vendor-advisoryx_refsource_MSPatchVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5448 | vdb-entryx_refsource_XFVDB Entry |
Change history (0)
No recorded changes yet.