CVE-2023-28099: OpenSIPS has vulnerability in the ds_is_in_list() function

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-15 · updated 2026-06-17
Weakness: CWE-20

Description

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.9 and 3.2.6, if `ds_is_in_list()` is used with an invalid IP address string (`NULL` is illegal input), OpenSIPS will attempt to print a string from a random address (stack garbage), which could lead to a crash. All users of `ds_is_in_list()` without the `$si` variable as 1st parameter could be affected by this vulnerability to a larger, lesser or no extent at all, depending if the data passed to the function is a valid IPv4 or IPv6 address string or not. Fixes will are available starting with the 3.1.9 and 3.2.6 minor releases. There are no known workarounds.

Affected products

opensips: before 3.1.9; from 3.2.0 before 3.2.6 — fixed in 3.1.9, 3.2.6

How to fix

Upgrade to a fixed version: opensips 3.1.9, 3.2.6. Check the vendor advisory for mitigations.

References

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