HOMEVULNERABILITIESCVE-2022-34747
CRITICAL

CVE-2022-34747

CWE-134Published: September 6, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet.

NVD Source

Technical Analysis

CVE-2022-34747 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

zyxel2 product(s)
nas326 firmwarenas326
Source: NVD CPE · 2 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

PATCHhttps://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml
PATCHhttps://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml

All References (2)

→
https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtmlPatch · Vendor Advisory
→
https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtmlPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2022-34747
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-134
CISA KEVNo
Affected1 vendor(s)
PublishedSep 6, 2022

Related CVEs (CWE-134)

CVE-2008-7228
10.0
CVE-2011-2475
10.0
CVE-2006-3628
10.0
CVE-2007-1006
10.0
CVE-2006-3573
10.0
CVE-2009-3732
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-34747 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. CVE data is provided under the NVD usage policy.
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