CVE-2022-27255

Name: CVE-2022-27255
Creator: NVD / NIST
Published: 2022-08-01T12:15:08.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 37.08%

Last modified Jun 17, 2026

CVE-2022-27255 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In Realtek eCos RSDK 1.5.7p1 and MSDK 4.9.4p1, the SIP ALG function that rewrites SDP data has a stack-based buffer overflow. This allows an attacker to remotely execute code without authentication via a crafted SIP packet that contains malicious SDP data.. EPSS estimates a 37.08% chance of exploitation in the next 30 days.

Description

In Realtek eCos RSDK 1.5.7p1 and MSDK 4.9.4p1, the SIP ALG function that rewrites SDP data has a stack-based buffer overflow. This allows an attacker to remotely execute code without authentication via a crafted SIP packet that contains malicious SDP data.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

37.08%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Realtek	Ecos Rsdk Firmware	1.5.7p1
Realtek	Ecos Msdk Firmware	4.9.4p1

References

https://forum.defcon.org/node/241835Third Party Advisory
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2022-27255.pdfVendor Advisory
https://forum.defcon.org/node/241835Third Party Advisory
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2022-27255.pdfVendor Advisory

Timeline

Published: Aug 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-27255?

How severe is CVE-2022-27255?

CVE-2022-27255 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 37.08% probability of exploitation in the next 30 days.

How do I fix CVE-2022-27255?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-27255?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST