HOMEVULNERABILITIESCVE-2022-27255
CRITICAL

CVE-2022-27255

CWE-20Published: August 1, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2022-27255 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

realtek4 product(s)
ecos rsdk firmwareecos rsdkecos msdk firmwareecos msdk
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://forum.defcon.org/node/241835
ADVISORYhttps://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2022-27255.pdf
ADVISORYhttps://forum.defcon.org/node/241835
ADVISORYhttps://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2022-27255.pdf

All References (4)

→
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

Quick Facts

CVE IDCVE-2022-27255
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedAug 1, 2022

Related CVEs (CWE-20)

CVE-2011-0923
10.0
CVE-2021-21321
10.0
CVE-2020-12388
10.0
CVE-2020-6962
10.0
CVE-2020-12389
10.0
CVE-2008-4509
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-27255 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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