CVE-2021-44790 EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 96.8% (pctl 100)
Patch early
A public exploit exists.
Description
A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 96.84% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-787 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2021-12-20 |
| Last modified | 2026-06-17 |
Affected (14)
| Vendor | Product |
|---|---|
| apache | http server |
| apple | mac os x |
| apple | macos |
| debian | debian linux |
| fedoraproject | fedora |
| netapp | cloud backup |
| oracle | communications element manager |
| oracle | communications operations monitor |
| oracle | communications session report manager |
| oracle | communications session route manager |
| oracle | http server |
| oracle | instantis enterprisetrack |
| oracle | zfs storage appliance kit |
| tenable | tenable.sc |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Apache 2.4.x - Buffer Overflow | 2023-04-01 |
References
- http://httpd.apache.org/security/vulnerabilities_24.html
- http://packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Overflow.html
- http://seclists.org/fulldisclosure/2022/May/33
- http://seclists.org/fulldisclosure/2022/May/35
- http://seclists.org/fulldisclosure/2022/May/38
- http://www.openwall.com/lists/oss-security/2021/12/20/4
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
- https://security.gentoo.org/glsa/202208-20
- https://security.netapp.com/advisory/ntap-20211224-0001/
- https://support.apple.com/kb/HT213255
- https://support.apple.com/kb/HT213256
- https://support.apple.com/kb/HT213257
- https://www.debian.org/security/2022/dsa-5035
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.tenable.com/security/tns-2022-01
- https://www.tenable.com/security/tns-2022-03
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