CVE-2000-0517: n/a vulnerability

CVE-2000-0517: Netscape 4.73 and earlier does not properly warn users about a potentially invalid certificate if the user...

Netscape 4.73 and earlier does not properly warn users about a potentially invalid certificate if the user has previously accepted the certificate for a different web site, which could allow remote attackers to spoof a legitimate web site by compromising that site's DNS information.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 05:21 UTC (UTC+00:00)

Security readout for executives and security teams

Old Netscape browsers (version 4.73 and earlier) could be tricked into trusting a fake website. If a user previously accepted a certificate for one site, the browser would not properly warn them when the same certificate appeared on a different site, letting an attacker who hijacked DNS impersonate that site. This is a legacy issue with no modern business impact for organizations that stopped using Netscape 4.x years ago. Effectively none in modern environments. Netscape 4.x has been end-of-life for over two decades and is not present in supported enterprise fleets. Residual exposure exists only on historical or air-gapped systems still running Netscape Communicator 4.73 or earlier. Informational only. This is a 2000-era browser flaw with no realistic impact on a modern estate. No emergency action is required; treat as part of routine legacy-software retirement hygiene. Mitigation focus: Retire any remaining Netscape 4.x browsers and migrate users to a currently supported browser.; Enforce DNSSEC and secure resolvers to reduce DNS spoofing risk against any legacy clients.; Block outbound TLS from legacy hosts that cannot be upgraded and isolate them on segmented networks..

Prepared: Jul 12, 2026, 01:09 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 13, 2000, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
netscape-ssl-certificate(4550)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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