httpd: log files contain information directly supplied by clients and does not filter or quote control characters
Published Jul 14, 2005
3.3
LOWCVSS 3.1
EPSS 3.56%
Description
The log files in Apache web server contain information directly supplied by clients and does not filter or quote control characters, which could allow remote attackers to hide HTTP requests and spoof source IP addresses when logs are viewed with UNIX programs such as cat, tail, and grep.
Affected products
No data.
- ≥ 1.3.0 · < 1.3.31
- ≥ 2.0.0 · < 2.0.49
No data.
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
httpd
Not affected
Red Hat Enterprise Linux 8
httpd:2.4/httpd
Not affected
Red Hat JBoss Core Services
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd22
Not affected
Red Hat Software Collections
httpd24-httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 8 | httpd:2.4/httpd | Not affected | n/a |
| Red Hat JBoss Core Services | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd22 | Not affected | n/a |
| Red Hat Software Collections | httpd24-httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This is a duplicate CVE name and is a combination of CVE-2003-0020 and CVE-2003-0083.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.56% (0.03564) | 88.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.56% (0.03564) | 87.82th | v5 (v2026.06.15) |
| Aug 12, 2025 | 1.65% (0.01654) | 81.24th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.20% (0.03202) | 85.85th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.97% (0.04974) | 82.42th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.20% (0.03202) | 86.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.89% (0.00885) | 83.24th | v3 (v2023.03.01) |
| Sep 17, 2024 | 0.89% (0.00885) | 82.78th | v3 (v2023.03.01) |
| Apr 25, 2024 | 2.10% (0.02103) | 88.99th | v3 (v2023.03.01) |
| Feb 8, 2024 | 2.49% (0.02494) | 89.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.89% (0.00885) | 80.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
References (7)
- http://archives.neohapsis.com/archives/bugtraq/2001-10/0231.html mailing-listx_refsource_BUGTRAQBroken Link
- http://httpd.apache.org/docs/logs.html x_refsource_CONFIRMVendor Advisory
- http://www.iss.net/security_center/static/7363.php vdb-entryx_refsource_XFBroken Link
- https://access.redhat.com/security/cve/CVE-2001-1556 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1891833 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2001-1556
- https://www.cve.org/CVERecord?id=CVE-2001-1556
| Link | Providers | Tags |
|---|---|---|
| http://archives.neohapsis.com/archives/bugtraq/2001-10/0231.html | mailing-listx_refsource_BUGTRAQBroken Link | |
| http://httpd.apache.org/docs/logs.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.iss.net/security_center/static/7363.php | vdb-entryx_refsource_XFBroken Link | |
| https://access.redhat.com/security/cve/CVE-2001-1556 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1891833 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2001-1556 | ||
| https://www.cve.org/CVERecord?id=CVE-2001-1556 |
Change history (0)
No recorded changes yet.