# CVE-2022-39028: inetutils: telnetd in GNU Inetutils through 2.3, MIT krb5-appl through 1.0.3, and derivative works has a NULL pointer dereferenc...

CVE-2022-39028 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2022-39028, released August 30, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-39028
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0235
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 29, 2022

## Description

telnetd in GNU Inetutils through 2.3, MIT krb5-appl through 1.0.3, and derivative works has a NULL pointer dereference via 0xff 0xf7 or 0xff 0xf8. In a typical installation, the telnetd application would crash but the telnet service would remain available through inetd. However, if the telnetd application has many crashes within a short time interval, the telnet service would become unavailable after inetd logs a "telnet/tcp server failing (looping), service terminated" error. NOTE: MIT krb5-appl is not supported upstream but is shipped by a few Linux distributions. The affected code was removed from the supported MIT Kerberos 5 (aka krb5) product many years ago, at version 1.8.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | inetutils Debian 12.15 (bookworm) | 2:2.3-5 | [DEBIAN-CVE-2022-39028](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39028.md) | Aug 30, 2022 |
| Linux | inetutils Debian 13.5 (trixie) | 2:2.3-5 | [DEBIAN-CVE-2022-39028](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39028.md) | Aug 30, 2022 |
| Linux | inetutils Debian 14 | 2:2.3-5 | [DEBIAN-CVE-2022-39028](https://patchblox.com/security/data/fix/linux/debian-cve-2022-39028.md) | Aug 30, 2022 |
| Linux | inetutils-ftp Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-ftp 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-ftp-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-ftp Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-ftp 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-ftp-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-ftp Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-ftp 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-ftp-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-ftpd Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-ftpd 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-ftpd-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-ftpd Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-ftpd 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-ftpd-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-ftpd Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-ftpd 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-ftpd-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-inetd Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-inetd 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-inetd-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-inetd Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-inetd 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-inetd-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-inetd Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-inetd 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-inetd-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-ping Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-ping 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-ping-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-ping Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-ping 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-ping-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-ping Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-ping 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-ping-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-syslogd Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-syslogd 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-syslogd-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-syslogd Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-syslogd 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-syslogd-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-syslogd Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-syslogd 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-syslogd-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-talk Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-talk 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-talk-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-talk Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-talk 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-talk-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-talk Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-talk 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-talk-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-talkd Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-talkd 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-talkd-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-talkd Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-talkd 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-talkd-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-talkd Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-talkd 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-talkd-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-telnet Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-telnet 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-telnet-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-telnet Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-telnet 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-telnet-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-telnet Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-telnet 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-telnet-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-telnetd Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-telnetd 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-telnetd-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-telnetd Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-telnetd 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-telnetd-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-telnetd Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-telnetd 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-telnetd-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-tools Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-tools 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-tools-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-tools Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-tools 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-tools-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-tools Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-tools 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-tools-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |
| Linux | inetutils-traceroute Ubuntu 18.04.6 LTS (bionic) | 2:1.9.4-3ubuntu0.1+esm2 | [inetutils-traceroute 2:1.9.4-3ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-inetutils-traceroute-2-1.9.4-3ubuntu0.1-esm2.md) | Aug 13, 2023 |
| Linux | inetutils-traceroute Ubuntu 20.04 LTS (focal) | 2:1.9.4-11ubuntu0.2 | [inetutils-traceroute 2:1.9.4-11ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-inetutils-traceroute-2-1.9.4-11ubuntu0.2.md) | Aug 13, 2023 |
| Linux | inetutils-traceroute Ubuntu 22.04.1 LTS (jammy) | 2:2.2-2ubuntu0.1 | [inetutils-traceroute 2:2.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-inetutils-traceroute-2-2.2-2ubuntu0.1.md) | Aug 13, 2023 |

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