Which products and versions are affected by CVE-2001-1319?

Affected: Exchange Server (Microsoft) versions 2000, 5.5. The full list is in the CVE brief.

Is CVE-2001-1319 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2001-1319 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2001-1319?

No public exploit code is known.

Is there a fix for CVE-2001-1319?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2001-1319 be patched?

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

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CVE-2001-1319Exchange Server Vulnerability

Microsoft Exchange 5.5 2000 allows remote attackers to cause a denial of service (hang) via exceptional BER encodings for the LDAP filter type field, as demonstrated by the PROTOS LDAPv3 test suite.

Published Jul 16, 2001 · Updated Apr 15, 2026

Key Facts

Routine patching

CVE-2001-1319 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Exchange Server (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 33% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Scores

CVSS v2

5.0

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

EPSS (30-day exploit likelihood)

33%

Higher than 98.3% of all scored CVEs

Exploit maturity

None known

ATLAS score

34/100

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

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

advisoryexchange-ldap-protos-dos(6899)
advisoryCA-2001-18
advisoryhttp://www.ee.oulu.fi/research/ouspg/protos/testing/c06/ldapv3/
advisoryVU#763400
advisoryhttp://www.kb.cert.org/vuls/id/CFCN-4YAQC7
advisory3045

Description

Microsoft Exchange 5.5 2000 allows remote attackers to cause a denial of service (hang) via exceptional BER encodings for the LDAP filter type field, as demonstrated by the PROTOS LDAPv3 test suite.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Exchange ServerMicrosoft	2000, 5.5	n/a

Timeline

Publicly disclosed
Jul 16, 2001
Last updated
Apr 15, 2026

References

2 more references in the full CVE brief

FAQ

Common Questions.

Microsoft Exchange 5.5 2000 allows remote attackers to cause a denial of service (hang) via exceptional BER encodings for the LDAP filter type field, as demonstrated by the PROTOS LDAPv3 test suite.
Affected: Exchange Server (Microsoft) versions 2000, 5.5. 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: routine patching, as no exploitation is known and its severity is moderate or low.

Is CVE-2001-1319 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.