CVE-2001-0338 — Internet Explorer 5.5 and earlier does not properly validate digital certificates when Certificate Revocation List (CRL) checking is enabled, which could allow remote attackers to spoof trusted web sites, aka the "Server certificate validation vulnerability."

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MEDIUM

Internet Explorer 5.5 and earlier does not properly validate digital certificates when Certificate Revocation List (CRL) checking is enabled, which could allow remote attackers to spoof trusted web sites, aka the "Server certificate validation vulnerability."

Published Sep 18, 2001

5.1

MEDIUM

CVSS 2.0

EPSS 5.32%

Description

Internet Explorer 5.5 and earlier does not properly validate digital certificates when Certificate Revocation List (CRL) checking is enabled, which could allow remote attackers to spoof trusted web sites, aka the "Server certificate validation vulnerability."

Affected products

Remediation

No remediation recorded yet.

Metrics

5.32% 0.05321

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.05321

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	5.32% (0.05321)	92.35th	v5 (v2026.06.15)
Jun 15, 2026	5.32% (0.05321)	91.53th	v5 (v2026.06.15)
Mar 17, 2025	1.67% (0.01673)	80.87th	v4 (v2025.03.14)
Dec 12, 2024	1.02% (0.01021)	84.46th	v3 (v2023.03.01)
Apr 4, 2024	1.02% (0.01021)	83.47th	v3 (v2023.03.01)
Mar 7, 2023	1.02% (0.01021)	81.47th	v3 (v2023.03.01)
Mar 6, 2023	13.53% (0.13525)	95.77th	v2 (v2022.01.01)
Apr 1, 2022	13.53% (0.13525)	95.40th	v2 (v2022.01.01)
Feb 4, 2022	13.53% (0.13525)	90.66th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (4)

http://www.ciac.org/ciac/bulletins/l-087.shtml
third-party-advisorygovernment-resourcex_refsource_CIAC
http://www.securityfocus.com/bid/2735
vdb-entryx_refsource_BID
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-027
vendor-advisoryx_refsource_MS
https://exchange.xforce.ibmcloud.com/vulnerabilities/6555
vdb-entryx_refsource_XF

Link	Providers	Tags
http://www.ciac.org/ciac/bulletins/l-087.shtml		third-party-advisorygovernment-resourcex_refsource_CIAC
http://www.securityfocus.com/bid/2735		vdb-entryx_refsource_BID
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-027		vendor-advisoryx_refsource_MS
https://exchange.xforce.ibmcloud.com/vulnerabilities/6555		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Sep 18, 2001

Updated Aug 8, 2024

Reserved May 10, 2001

Link CVE-2001-0338

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2001-0338

Red Hat

Severity n/a

Public date n/a

Links CVE-2001-0338