Vulnerability in Microsoft Exchange Server

CVE-1999-0993

Modifications to ACLs (Access Control Lists) in Microsoft Exchange 5.5 do not take effect until the directory store cache is refreshed.

Vulnerability class: Dirty Pipe (CVE-2022-0847)

Published · last modified .

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: 0.071 (94.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-1999-0993: held from 0.069 to 0.071.

EPSS over last 30 days · oldest: 0.069 · newest: 0.071 · change: +0.001

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-1999-0993?
CVE-1999-0993 is a vulnerability in Microsoft Exchange Server, classified under Improper Initialization. Published 1999-12-13.
Is CVE-1999-0993 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.