CVE-2021-32675
Fixed in a distro release EPSS 16%CVSS 7.5
Redis is an open source, in-memory database that persists on disk. When parsing an incoming Redis Standard Protocol (RESP) request, Redis allocates memory according to user-specified values which determine the number of elements (in the multi-bulk header) and size of each element (in the bulk header). An attacker delivering specially crafted requests over multiple connections can cause the server to allocate significant amount of memory. Because the same parsing mechanism is used to handle authentication requests, this vulnerability can also be exploited by unauthenticated users. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways: Using network access control tools like firewalls, iptables, security groups, etc. or Enabling TLS and requiring users to authenticate using client side certificates.
Products: Redis
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 8 | redis | 5.0.3-5.module_el8.4.0+2583+b9845322 |
| AlmaLinux 8 | redis | 5.0.3-5.module_el8.5.0+66+fc19ec12 |
| AlmaLinux 8 | redis | 6.0.9-5.module_el8.5.0+67+a3c431d9 |
| AlmaLinux 8 | redis | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa |
| AlmaLinux 8 | redis-devel | 5.0.3-5.module_el8.5.0+66+fc19ec12 |
| AlmaLinux 8 | redis-devel | 5.0.3-5.module_el8.4.0+2583+b9845322 |
| AlmaLinux 8 | redis-devel | 6.0.9-5.module_el8.5.0+67+a3c431d9 |
| AlmaLinux 8 | redis-devel | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa |
| AlmaLinux 8 | redis-doc | 5.0.3-5.module_el8.4.0+2583+b9845322 |
| AlmaLinux 8 | redis-doc | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa |
| Alpine 3.11 | redis | 5.0.14-r0 |
| Alpine 3.12 | redis | 5.0.14-r0 |
| Alpine 3.13 | redis | 6.0.16-r0 |
| Alpine 3.14 | redis | 6.2.6-r0 |
| Alpine 3.15 | redis | 6.2.6-r0 |
| Alpine 3.16 | redis | 6.2.6-r0 |
| Alpine 3.17 | redis | 6.2.6-r0 |
| Alpine 3.18 | redis | 6.2.6-r0 |
| Alpine 3.19 | redis | 6.2.6-r0 |
| Debian 10 | redis | 5:5.0.14-1+deb10u1 |
| Debian 11 | redis | 5:6.0.16-1+deb11u1 |
| Debian 12 | redis | 5:6.0.16-1 |
| Debian 13 | redis | 5:6.0.16-1 |
| Debian 14 | redis | 5:6.0.16-1 |
| Debian 9 | redis | 3:3.2.6-3+deb9u8 |
| Red Hat Enterprise Linux 8 | redis | 0:5.0.3-5.module+el8.4.0+12927+b9845322 |
| Red Hat Enterprise Linux 8 | redis | 0:6.0.9-5.module+el8.4.0+12929+1bb0d2aa |
| Red Hat Enterprise Linux 8 | redis-debuginfo | 0:5.0.3-5.module+el8.4.0+12927+b9845322 |
| Red Hat Enterprise Linux 8 | redis-debuginfo | 0:6.0.9-5.module+el8.4.0+12929+1bb0d2aa |
| Red Hat Enterprise Linux 8 | redis-debugsource | 0:5.0.3-5.module+el8.4.0+12927+b9845322 |
| Red Hat Enterprise Linux 8 | redis-debugsource | 0:6.0.9-5.module+el8.4.0+12929+1bb0d2aa |
| Red Hat Enterprise Linux 8 | redis-devel | 0:6.0.9-5.module+el8.4.0+12929+1bb0d2aa |
| Red Hat Enterprise Linux 8 | redis-devel | 0:5.0.3-5.module+el8.4.0+12927+b9845322 |
| Red Hat Enterprise Linux 8 | redis-doc | 0:5.0.3-5.module+el8.4.0+12927+b9845322 |
| Red Hat Enterprise Linux 8 | redis-doc | 0:6.0.9-5.module+el8.4.0+12929+1bb0d2aa |
| Red Hat openstack 10 | redis | 0:3.2.8-5.el7ost |
| Red Hat openstack 10 | redis-debuginfo | 0:3.2.8-5.el7ost |
| Red Hat openstack 13 | redis | 0:3.2.8-5.el7ost |
| Red Hat openstack 13 | redis-debuginfo | 0:3.2.8-5.el7ost |
| Red Hat rhel eus 8.1 | redis | 0:5.0.3-5.module+el8.1.0+12925+6460abef |
| Red Hat rhel eus 8.1 | redis-debuginfo | 0:5.0.3-5.module+el8.1.0+12925+6460abef |
| Red Hat rhel eus 8.1 | redis-debugsource | 0:5.0.3-5.module+el8.1.0+12925+6460abef |
| Red Hat rhel eus 8.1 | redis-devel | 0:5.0.3-5.module+el8.1.0+12925+6460abef |
| Red Hat rhel eus 8.1 | redis-doc | 0:5.0.3-5.module+el8.1.0+12925+6460abef |
| Red Hat rhel eus 8.2 | redis | 0:5.0.3-5.module+el8.2.0+12926+485b5fc9 |
| Red Hat rhel eus 8.2 | redis-debuginfo | 0:5.0.3-5.module+el8.2.0+12926+485b5fc9 |
| Red Hat rhel eus 8.2 | redis-debugsource | 0:5.0.3-5.module+el8.2.0+12926+485b5fc9 |
| Red Hat rhel eus 8.2 | redis-devel | 0:5.0.3-5.module+el8.2.0+12926+485b5fc9 |
| Red Hat rhel eus 8.2 | redis-doc | 0:5.0.3-5.module+el8.2.0+12926+485b5fc9 |
| Red Hat rhel software collections 3 | rh-redis5-redis | 0:5.0.5-3.el7 |
| Red Hat rhel software collections 3 | rh-redis5-redis-debuginfo | 0:5.0.5-3.el7 |
| Rocky Linux 8 | redis | 0:6.0.9-5.module+el8.4.0+660+a8447b97 |
| Rocky Linux 8 | redis | 0:5.0.3-5.module+el8.5.0+657+2674830e |
| Rocky Linux 8 | redis | 0:5.0.3-5.module+el8.4.0+659+cf535ef1 |
| Rocky Linux 8 | redis | 0:6.0.9-5.module+el8.5.0+658+72172854 |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | redis | 6.0.14-6.8.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | redis | 6.0.14-6.8.1 |
| Ubuntu Pro 14.04 LTS | redis | 2:2.8.4-2ubuntu0.2+esm2 |
| Ubuntu Pro 16.04 LTS | redis | 2:3.0.6-1ubuntu0.4+esm1 |
| Ubuntu Pro 18.04 LTS | redis | 5:4.0.9-1ubuntu0.2+esm3 |
| Ubuntu Pro 20.04 LTS | redis | 5:5.0.7-2ubuntu0.1+esm1 |
| openSUSE Leap 15.3 | redis | 6.0.14-6.8.1 |
| openSUSE Tumbleweed | redis | 6.2.6-1.1 |