CVE-2022-39028

Publication date 30 August 2022

Last updated 29 September 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
inetutils 25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Fixed 2:2.2-2ubuntu0.1
20.04 LTS focal
Fixed 2:1.9.4-11ubuntu0.2
18.04 LTS bionic
Fixed 2:1.9.4-3ubuntu0.1+esm2
16.04 LTS xenial
Fixed 2:1.9.4-1ubuntu0.1~esm3
14.04 LTS trusty
Fixed 2:1.9.2-1ubuntu0.1~esm2

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Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-6304-1
    • Inetutils vulnerabilities
    • 22 August 2023
    • USN-7781-1
    • Inetutils vulnerabilities
    • 28 September 2025

Other references