CRITICAL
Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or '>' characters, which trigger the overflow when the characters are expanded to "<" and ">" sequences
Published Oct 30, 2003
9.8
CRITICALCVSS 3.1
EPSS 22.19%
Description
Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or '>' characters, which trigger the overflow when the characters are expanded to "<" and ">" sequences.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
22.19% 0.22187
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.22187
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 (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 22.19% (0.22187) | 97.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 21.68% (0.21679) | 97.31th | v5 (v2026.06.15) |
| Dec 28, 2025 | 20.46% (0.20457) | 95.35th | v4 (v2025.03.14) |
| Dec 27, 2025 | 36.22% (0.36216) | 96.98th | v4 (v2025.03.14) |
| Oct 28, 2025 | 20.96% (0.20964) | 95.39th | v4 (v2025.03.14) |
| Oct 27, 2025 | 36.22% (0.36216) | 96.93th | v4 (v2025.03.14) |
| Oct 1, 2025 | 20.96% (0.20964) | 95.47th | v4 (v2025.03.14) |
| Jul 4, 2025 | 36.22% (0.36216) | 96.92th | v4 (v2025.03.14) |
| Mar 30, 2025 | 29.19% (0.29192) | 96.18th | v4 (v2025.03.14) |
| Mar 29, 2025 | 37.38% (0.37376) | 95.69th | v4 (v2025.03.14) |
| Mar 17, 2025 | 29.19% (0.29192) | 96.18th | v4 (v2025.03.14) |
| Mar 9, 2025 | 9.35% (0.09347) | 94.86th | v3 (v2023.03.01) |
| Dec 17, 2024 | 11.61% (0.11605) | 95.25th | v3 (v2023.03.01) |
| Feb 8, 2024 | 19.30% (0.19301) | 96.11th | v3 (v2023.03.01) |
| Feb 3, 2024 | 27.58% (0.27577) | 96.40th | v3 (v2023.03.01) |
| Nov 14, 2023 | 35.13% (0.35125) | 96.70th | v3 (v2023.03.01) |
| Mar 7, 2023 | 29.80% (0.29800) | 96.19th | v3 (v2023.03.01) |
| Mar 6, 2023 | 20.10% (0.20096) | 96.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 20.10% (0.20096) | 96.11th | v2 (v2022.01.01) |
| Feb 4, 2022 | 20.10% (0.20096) | 93.97th | v2 (v2022.01.01) |
Weaknesses (1)
References (7)
- http://marc.info/?l=bugtraq&m=106729188224252&w=2 mailing-listx_refsource_BUGTRAQExploitMailing List
- http://secunia.com/advisories/10092 third-party-advisoryx_refsource_SECUNIABroken LinkPatchVendor Advisory
- http://www.osvdb.org/2729 vdb-entryx_refsource_OSVDBBroken Link
- http://www.securityfocus.com/bid/8906 vdb-entryx_refsource_BIDBroken LinkExploitPatchThird Party AdvisoryVDB Entry
- http://www.texonet.com/advisories/TEXONET-20030908.txt x_refsource_MISCBroken LinkURL Repurposed
- https://exchange.xforce.ibmcloud.com/vulnerabilities/13530 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://www.debian.org/security/2003/dsa-396 vendor-advisoryx_refsource_DEBIANBroken Link
| Link | Providers | Tags |
|---|---|---|
| http://marc.info/?l=bugtraq&m=106729188224252&w=2 | mailing-listx_refsource_BUGTRAQExploitMailing List | |
| http://secunia.com/advisories/10092 | third-party-advisoryx_refsource_SECUNIABroken LinkPatchVendor Advisory | |
| http://www.osvdb.org/2729 | vdb-entryx_refsource_OSVDBBroken Link | |
| http://www.securityfocus.com/bid/8906 | vdb-entryx_refsource_BIDBroken LinkExploitPatchThird Party AdvisoryVDB Entry | |
| http://www.texonet.com/advisories/TEXONET-20030908.txt | x_refsource_MISCBroken LinkURL Repurposed | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/13530 | vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry | |
| https://www.debian.org/security/2003/dsa-396 | vendor-advisoryx_refsource_DEBIANBroken Link |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Oct 30, 2003
Updated Aug 8, 2024
Reserved Oct 28, 2003
Link CVE-2003-0899
CISA Vulnrichment
Updated n/a