CVE-2007-0221Exchange Server Integer Overflow
Integer overflow in the IMAP (IMAP4) support in Microsoft Exchange Server 2000 SP3 allows remote attackers to cause a denial of service (service hang) via crafted literals in an IMAP command, aka the "IMAP Literal Processing Vulnerability."
Published May 8, 2007 · Updated Apr 22, 2026
Key Facts
Patch in the next maintenance window- CVE-2007-0221 is a high-severity vulnerability (CVSS 7.8 v2) affecting Exchange Server (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 37% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v2
7.8
AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS (30-day exploit likelihood)
37%
Higher than 98.5% of all scored CVEs
Exploit maturity
None known
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryexchange-imap-command-dos(33890)
- advisoryoval:org.mitre.oval:def:2054
- advisoryHPSBST02214
- advisory23810
- advisoryTA07-128A
- patch20070508 Microsoft Exchange Server 2000 IMAP Literal Processing DoS Vulnerability
Description
Integer overflow in the IMAP (IMAP4) support in Microsoft Exchange Server 2000 SP3 allows remote attackers to cause a denial of service (service hang) via crafted literals in an IMAP command, aka the "IMAP Literal Processing Vulnerability."
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Exchange ServerMicrosoft | 2000-sp3 | n/a |
Timeline
Publicly disclosed
May 8, 2007
Last updated
Apr 22, 2026
Weakness Type
- CWE-190 Integer Overflow or Wraparound
References
- advisoryexchange-imap-command-dos(33890)
- advisoryoval:org.mitre.oval:def:2054
- advisoryHPSBST02214
- advisory23810
- advisoryTA07-128A
FAQ
Common Questions.
Integer overflow in the IMAP (IMAP4) support in Microsoft Exchange Server 2000 SP3 allows remote attackers to cause a denial of service (service hang) via crafted literals in an IMAP command, aka the "IMAP Literal Processing Vulnerability."
Affected: Exchange Server (Microsoft) versions 2000-sp3. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Is CVE-2007-0221 On Your Attack Surface?
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