Vulnerability · Published Mar 2, 2022 · Assigned by redhat
CVE-2021-23192
High 7.5
In plain English
A high-severity improper input validation in samba. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.0%top 19.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | libsmbclient-devel | 4.14.5-7.el8_5 | ALSA-2021:5082 |
| AlmaLinux:8 | libwbclient-devel | 4.14.5-7.el8_5 | ALSA-2021:5082 |
| AlmaLinux:8 | samba-devel | 4.14.5-7.el8_5 | ALSA-2021:5082 |
| AlmaLinux:8 | samba-vfs-iouring | 4.14.5-7.el8_5 | ALSA-2021:5082 |
| Alpine:v3.20 | samba | 4.15.2-r0 | ALPINE-CVE-2021-23192 |
| Alpine:v3.21 | samba | 4.15.2-r0 | ALPINE-CVE-2021-23192 |
| Alpine:v3.22 | samba | 4.15.2-r0 | ALPINE-CVE-2021-23192 |
| Alpine:v3.23 | samba | 4.15.2-r0 | ALPINE-CVE-2021-23192 |
| Alpine:v3.24 | samba | 4.15.2-r0 | ALPINE-CVE-2021-23192 |
| Debian:12 | samba | 2:4.13.14+dfsg-1 | DEBIAN-CVE-2021-23192 |
| Debian:13 | samba | 2:4.13.14+dfsg-1 | DEBIAN-CVE-2021-23192 |
| Debian:14 | samba | 2:4.13.14+dfsg-1 | DEBIAN-CVE-2021-23192 |
| Rocky Linux:8 | samba | 0:4.14.5-7.el8_5 | RLSA-2021:5082 |
| Ubuntu:22.04:LTS | samba | 2:4.13.14+dfsg-0ubuntu1 | UBUNTU-CVE-2021-23192 |
Affected products (as reported)
Weakness: CWE-20