What is CVE-2005-1987?

CVE-2005-1987 is a vulnerability in Microsoft Exchange Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2005-10-13.

Is CVE-2005-1987 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Exchange Server

CVE-2005-1987

Buffer overflow in Collaboration Data Objects (CDO), as used in Microsoft Windows and Microsoft Exchange Server, allows remote attackers to execute arbitrary code when CDOSYS or CDOEX processes an e-mail message with a large header name, as demonstrated using the "Content-Type" string.

Vulnerability class: Buffer Overflow

Published 2005-10-13 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.5 (High). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.434 (98.7th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.445 · newest: 0.434 · change: -0.011

Affected products

Microsoft Exchange Server — versions 2000
Microsoft Windows 2000
Microsoft Windows Server 2003 — versions r2, sp1
Microsoft Windows Xp

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.osvdb.org/19905 (vdb-entry, Broken Link)
support.microsoft.com/default.aspx (vendor-advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:581 (signature, Third Party Advisory, vdb-entry)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:1406 (signature, Third Party Advisory, vdb-entry)
www.kb.cert.org/vuls/id/883460 (US Government Resource, Third Party Advisory, third-party-advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:848 (signature, Third Party Advisory, vdb-entry)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:1515 (signature, Third Party Advisory, vdb-entry)
exchange.xforce.ibmcloud.com/vulnerabilities/22495 (VDB Entry, Third Party Advisory, vdb-entry)
secunia.com/advisories/17167 (Third Party Advisory, third-party-advisory)
www.securityfocus.com/bid/15067 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2005-1987?: CVE-2005-1987 is a vulnerability in Microsoft Exchange Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2005-10-13.
Is CVE-2005-1987 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.