How severe is CVE-2005-2089?

CVE-2005-2089 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2005-2089 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-2089?

CVE-2005-2089 primarily affects Microsoft Internet Information Services. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-2089?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2005-2089 published?

CVE-2005-2089 was published on 2005-07-05 and last updated on 2026-06-16.

CVE-2005-2089

CVE-2005-2089 is a medium-severity vulnerability in Microsoft Internet Information Services with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 31% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-444.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 31% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Microsoft Internet Information Services
Published: 2005-07-05
Last modified: 2026-06-16

Description

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."

Frequently asked questions

What is CVE-2005-2089?: 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."
How severe is CVE-2005-2089?: CVE-2005-2089 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2005-2089 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-2089?: CVE-2005-2089 primarily affects Microsoft Internet Information Services. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-2089?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-2089 published?: CVE-2005-2089 was published on 2005-07-05 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:internet_information_services:5.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_information_services:6.0:*:*:*:*:*:*:*

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Other CWE-444 (HTTP Request/Response Smuggling) vulnerabilities

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CVE-2020-15049 — Critical (CVSS 9.9): An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request…
CVE-2026-13763 — Critical (CVSS 9.8): Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer with AWS WAF enabled might allow remote…

Browse all CWE-444 (HTTP Request/Response Smuggling) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

200.71.154.142 (ipv4-addr)
190.111.226.20 (ipv4-addr)