CVE-2021-23017
nginx-mod-mail: nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, a...
CVE-2021-23017 is fixed in 33 products on 1 platform, first by libnginx-mod-http-auth-pam 1.14.0-0ubuntu1.9, released May 24, 2021. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.4
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.5346
98th percentile
nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage. The following packages have been upgraded to a later upstream version: nginx (1.20.1). (BZ#2031030) Security Fix(es): * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libnginx-mod-http-auth-pam · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-auth-pam 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-auth-pam · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-auth-pam 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-cache-purge · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-cache-purge 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-cache-purge · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-cache-purge 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-dav-ext · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-dav-ext 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-dav-ext · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-dav-ext 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-echo · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-echo 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-echo · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-echo 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-fancyindex · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-fancyindex 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-fancyindex · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-fancyindex 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-geoip · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-geoip 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-geoip · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-geoip 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-geoip2 · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-geoip2 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-headers-more-filter · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-headers-more-filter 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-headers-more-filter · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-headers-more-filter 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-image-filter · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-image-filter 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-image-filter · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-image-filter 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-lua · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-lua 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-lua · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-lua 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-ndk · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-ndk 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-ndk · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-ndk 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-perl · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-perl 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-perl · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-perl 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-subs-filter · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-subs-filter 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-subs-filter · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-subs-filter 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-uploadprogress · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-uploadprogress 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-uploadprogress · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-uploadprogress 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-upstream-fair · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-upstream-fair 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-upstream-fair · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-upstream-fair 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-http-xslt-filter · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-http-xslt-filter 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-http-xslt-filter · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-http-xslt-filter 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-mail · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-mail 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-mail · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-mail 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-nchan · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-nchan 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-nchan · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-nchan 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-rtmp · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-rtmp 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-rtmp · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-rtmp 1.18.0-0ubuntu1.2 | May 24, 2021 |
| libnginx-mod-stream · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | libnginx-mod-stream 1.14.0-0ubuntu1.9 | May 24, 2021 |
| libnginx-mod-stream · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | libnginx-mod-stream 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx · almalinux 8 | 1:1.20.1-1.module_el8.6.0+2782+a022aca3.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx · rocky 8 | 1:1.20.1-1.module+el8.6.0+791+48a2bb9d | RLSA-2022:0323 | Jan 31, 2022 |
| nginx-all-modules · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-all-modules · almalinux 8 | 1:1.20.1-1.module_el8.5.0+2611+ab304644.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-all-modules · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-common · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx-common 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx-common · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx-common 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx-core · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx-core 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx-core · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx-core 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx-extras · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx-extras 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx-extras · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx-extras 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx-filesystem · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-filesystem · almalinux 8 | 1:1.20.1-1.module_el8.5.0+2611+ab304644.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-filesystem · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-full · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx-full 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx-full · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx-full 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx-light · Ubuntu 18.04.6 LTS (bionic) | 1.14.0-0ubuntu1.9 | nginx-light 1.14.0-0ubuntu1.9 | May 24, 2021 |
| nginx-light · Ubuntu 20.04 LTS (focal) | 1.18.0-0ubuntu1.2 | nginx-light 1.18.0-0ubuntu1.2 | May 24, 2021 |
| nginx-mod-http-image-filter · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-image-filter · almalinux 8 | 1:1.20.1-1.module_el8.6.0+2782+a022aca3.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-image-filter · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-mod-http-perl · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-perl · almalinux 8 | 1:1.20.1-1.module_el8.5.0+2611+ab304644.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-perl · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-mod-http-xslt-filter · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-xslt-filter · almalinux 8 | 1:1.20.1-1.module_el8.5.0+2611+ab304644.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-http-xslt-filter · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-mod-mail · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-mail · almalinux 8 | 1:1.20.1-1.module_el8.6.0+2782+a022aca3.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-mail · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
| nginx-mod-stream · RHEL 8 | 1:1.20.1-1.module+el8.5.0+13723+ab304644 | RHSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-stream · almalinux 8 | 1:1.20.1-1.module_el8.6.0+2782+a022aca3.alma | ALSA-2022:0323 | Jan 31, 2022 |
| nginx-mod-stream · ol 8 | 1:1.18.0-3.0.1.module+el8.4.0+20183+8c128c59.1 | ELSA-2021-2259 | Jun 8, 2021 |
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