CVE-2005-2089: n/a vulnerability

CVE-2005-2089: Microsoft IIS 5.0 and 6.0 allows remote attackers to poison the web cache, bypass web application firewall...

Microsoft IIS 5.0 and 6.0 allows remote attackers to poison the web cache, bypass web application firewall protection, and conduct XSS attacks via an HTTP request with both a "Transfer-Encoding: chunked" header and a Content-Length header, which causes IIS to incorrectly handle and forward the body of the request in a way that causes the receiving server to process it as a separate HTTP request, aka "HTTP Request Smuggling."

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 22:15 UTC (UTC+00:00)

Security readout for executives and security teams

This issue affects Microsoft IIS 5.0 and 6.0 handling of ambiguous HTTP request bodies. A remote attacker could make IIS and a downstream server disagree about where one request ends, enabling cache poisoning, WAF bypass, or cross-site scripting impacts. Exposure is most likely on legacy Microsoft IIS 5.0 or 6.0 deployments, especially internet-facing systems using proxies, web caches, WAFs, or backend forwarding. The bundle does not identify CPEs or specific supported configurations. Treat this as high priority if legacy IIS 5.0 or 6.0 remains exposed. The business risk is indirect but serious: attackers may bypass protective layers or poison shared web responses. No active exploitation is shown in the supplied sources. Mitigation focus: Check Microsoft and vendor guidance for IIS 5.0 and 6.0 HTTP request handling fixes.; Retire or isolate legacy IIS 5.0 and 6.0 systems where possible.; Normalize or reject requests containing conflicting Transfer-Encoding and Content-Length headers at trusted edges..

Prepared: Jun 29, 2026, 19:30 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: Jun 30, 2005, 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
microsoft-iis-hrs(42899)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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