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CVE-1999-0945

22
FAUCET Score

CVE-1999-0945 describes a buffer overflow vulnerability in Microsoft Exchange 5.0 and 5.5's Internet Mail Service (IMS). This flaw allows unauthenticated remote attackers to trigger a denial of service by sending specially crafted AUTH or AUTHINFO commands. Rated as Medium severity (CVSS 5.0), it requires no authentication and has a low attack complexity, leading to potential service unavailability. While no active exploitation or public exploit code is known, and it lacks community discussion or media coverage, its age and the affected product's end-of-life status make it a legacy concern.

Impacted Technologies

VendorProductVersion(s)CPE
5.0CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.0:-:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
19.52%
Probability of exploitation in next 30 days
EPSS Percentile
97.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1952 is in the 97th percentile among its peer group of 23,723 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/1223
VDB Entry
support.microsoft.com / default.aspx
ciac.org / ciac/bulletins/i-080.shtml
PatchVendor Advisory
xforce.iss.net / alerts/advise4.php
PatchVendor Advisory