Vulnerability · Published Jun 10, 2021 · Assigned by apache
CVE-2020-13950mod_proxy_http NULL pointer dereference
High 7.5
In plain English
A high-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 50.0% (higher than 99% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)50.0%top 1.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-13950 |
| Alpine:v3.21 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-13950 |
| Alpine:v3.22 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-13950 |
| Alpine:v3.23 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-13950 |
| Alpine:v3.24 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-13950 |
| Debian:12 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-13950 |
| Debian:13 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-13950 |
| Debian:14 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-13950 |
| Rocky Linux:8 | httpd | 0:2.4.37-47.module+el8.6.0+823+f143cee1.1 | RLSA-2022:5163 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2022:5163 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2022:5163 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2022:5163 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.462.4.432.4.41 |
References
- http://httpd.apache.org/security/vulnerabilities_24.html x_refsource_MISC
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E x_refsource_MISC
- [httpd-announce] 20210609 CVE-2020-13950: mod_proxy_http NULL pointer dereference mailing-list, x_refsource_MLIST
- [httpd-dev] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.json mailing-list, x_refsource_MLIST
- [oss-security] 20210609 CVE-2020-13950: Apache httpd: mod_proxy_http NULL pointer dereference mailing-list, x_refsource_MLIST
- GLSA-202107-38 vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-dce7e7738e vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-e3f6dd670d vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0001/ x_refsource_CONFIRM