Buffer overflow in Apache HTTP Server
CVE-2021-44790
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.968 (99.9th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.968 · newest: 0.968 · change: 0.000
Affected products
- Apache HTTP Server
- Apache Software Foundation HTTP Server — versions Apache HTTP Server 2.4
- Apple macOS
- Apple Mac OS X — versions 10.15.7
- NetApp Cloud Backup
- Oracle Communications Element Manager
- Oracle Communications Operations Monitor — versions 4.3, 4.4, 5.0
- Oracle Communications Session Report Manager
- Oracle Communications Session Route Manager
- Oracle HTTP Server — versions 12.2.1.3.0, 12.2.1.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- httpd.apache.org/security/vulnerabilities_24.html (Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/12/20/4 (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2022/dsa-5035 (vendor-advisory, Third Party Advisory)
- www.oracle.com/security-alerts/cpujan2022.html (Patch, Third Party Advisory)
- security.netapp.com/advisory/ntap-20211224-0001/ (Third Party Advisory)
- www.tenable.com/security/tns-2022-01 (Third Party Advisory)
- www.tenable.com/security/tns-2022-03 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-44790?
- CVE-2021-44790 is a critical-severity vulnerability in Apache HTTP Server, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-20.
- How severe is CVE-2021-44790?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-44790 known to be exploited?
- 26 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.