CVE catalog
CVE-2021-3466
libmicrohttpd: CVE-2021-3466
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 8.74% · Oct 25, 2026
A flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attacker to write arbitrary data in an application that uses libmicrohttpd. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. Only version 0.9.70 is vulnerable.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libmicrohttpd | sid | 1.0.10-1 | fixed |
| Debian | libmicrohttpd | forky | 1.0.10-1 | fixed |
| Debian | libmicrohttpd | trixie | 1.0.1-4 | fixed |
| Debian | libmicrohttpd | bookworm | 0.9.75-6 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libmicrohttpd | source | sid | 0.9.71-1 | not yet assigned | Not reported | Not reported |
| Debian | libmicrohttpd | source | forky | 0.9.71-1 | not yet assigned | Not reported | Not reported |
| Debian | libmicrohttpd | source | trixie | 0.9.71-1 | not yet assigned | Not reported | Not reported |
| Debian | libmicrohttpd | source | bookworm | 0.9.71-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmicrohttpd12]Fixed
Source package: [libmicrohttpd]
Details (2)
0.9.75-6· amd64 · bookwormFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · bookworm; dsa · libmicrohttpd · debian · 12
0.9.75-6· arm64 · bookwormFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · bookworm; dsa · libmicrohttpd · debian · 12
- [libmicrohttpd-dev]Fixed
Source package: [libmicrohttpd]
Details (2)
0.9.75-6· amd64 · bookwormFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · bookworm; dsa · libmicrohttpd · debian · 12
0.9.75-6· arm64 · bookwormFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · bookworm; dsa · libmicrohttpd · debian · 12
[Debian 13 (Trixie)]
- [libmicrohttpd12t64]Fixed
Source package: [libmicrohttpd]
Details (2)
1.0.1-4· amd64 · trixieFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · 13
1.0.1-4· arm64 · trixieFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · 13
- [libmicrohttpd-dev]Fixed
Source package: [libmicrohttpd]
Details (2)
1.0.1-4· amd64 · trixieFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · 13
1.0.1-4· arm64 · trixieFixed · Fixed:
0.9.71-1dsa · libmicrohttpd · debian · 13
Observed: