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."
Published Jun 30, 2005
4.3
MEDIUMCVSS 2.0
EPSS 30.97%
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."
Affected products
No data.
- 5.0
- 6.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (30 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 30.97% (0.30970) | 98.21th | v5 (v2026.06.15) |
| Jun 15, 2026 | 30.97% (0.30970) | 98.02th | v5 (v2026.06.15) |
| Dec 28, 2025 | 35.63% (0.35633) | 96.91th | v4 (v2025.03.14) |
| Dec 27, 2025 | 31.00% (0.31004) | 96.60th | v4 (v2025.03.14) |
| Dec 16, 2025 | 35.63% (0.35633) | 96.90th | v4 (v2025.03.14) |
| Dec 10, 2025 | 42.09% (0.42086) | 97.29th | v4 (v2025.03.14) |
| Oct 28, 2025 | 35.63% (0.35633) | 96.87th | v4 (v2025.03.14) |
| Oct 27, 2025 | 31.00% (0.31004) | 96.54th | v4 (v2025.03.14) |
| Oct 1, 2025 | 35.80% (0.35799) | 96.97th | v4 (v2025.03.14) |
| Jul 30, 2025 | 31.00% (0.31004) | 96.56th | v4 (v2025.03.14) |
| Jul 29, 2025 | 42.09% (0.42086) | 97.30th | v4 (v2025.03.14) |
| Jul 4, 2025 | 54.34% (0.54337) | 97.87th | v4 (v2025.03.14) |
| Jul 1, 2025 | 48.07% (0.48068) | 97.60th | v4 (v2025.03.14) |
| Jun 4, 2025 | 54.34% (0.54337) | 97.85th | v4 (v2025.03.14) |
| Jun 1, 2025 | 48.07% (0.48068) | 97.59th | v4 (v2025.03.14) |
| May 4, 2025 | 54.34% (0.54337) | 97.84th | v4 (v2025.03.14) |
| May 1, 2025 | 48.07% (0.48068) | 97.57th | v4 (v2025.03.14) |
| Mar 30, 2025 | 54.34% (0.54337) | 97.81th | v4 (v2025.03.14) |
| Mar 29, 2025 | 59.10% (0.59096) | 97.45th | v4 (v2025.03.14) |
| Mar 23, 2025 | 54.34% (0.54337) | 97.73th | v4 (v2025.03.14) |
| Mar 17, 2025 | 58.42% (0.58422) | 97.98th | v4 (v2025.03.14) |
| Dec 17, 2024 | 44.73% (0.44733) | 97.45th | v3 (v2023.03.01) |
| Jun 6, 2024 | 39.74% (0.39742) | 97.26th | v3 (v2023.03.01) |
| Feb 9, 2024 | 46.07% (0.46068) | 97.30th | v3 (v2023.03.01) |
| Oct 20, 2023 | 79.19% (0.79188) | 97.91th | v3 (v2023.03.01) |
| May 21, 2023 | 96.17% (0.96170) | 99.22th | v3 (v2023.03.01) |
| Mar 7, 2023 | 96.37% (0.96366) | 99.21th | 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) |
References (4)
- http://seclists.org/lists/bugtraq/2005/Jun/0025.html mailing-listx_refsource_BUGTRAQMailing ListThird Party Advisory
- http://www.securiteam.com/securityreviews/5GP0220G0U.html x_refsource_MISCBroken Link
- http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf x_refsource_MISCBroken Link
- https://exchange.xforce.ibmcloud.com/vulnerabilities/42899 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://seclists.org/lists/bugtraq/2005/Jun/0025.html | mailing-listx_refsource_BUGTRAQMailing ListThird Party Advisory | |
| http://www.securiteam.com/securityreviews/5GP0220G0U.html | x_refsource_MISCBroken Link | |
| http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf | x_refsource_MISCBroken Link | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/42899 | vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.