A argument injection vulnerability in the 'packet-trace' CLI command of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FL…

published 2022-05-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-31089

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 4.8%; EPSS 4.8% chance of exploitation in 30 days, percentile 91%
public exploits: 0; none known

A argument injection vulnerability in the 'packet-trace' CLI command of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to execute arbitrary OS commands by including crafted arguments to the CLI command.

Patch / fix

fixed in 3

zyxel nsg300_firmware 1.33
zyxel nsg100_firmware 1.33
zyxel nsg50_firmware 1.33

Exploit prediction

4.79% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

Zyxel USG/ZyWALL series firmware
Zyxel USG FLEX series firmware
Zyxel ATP series firmware
Zyxel VPN series firmware
Zyxel NSG series firmware
Zyxel NXC2500 firmware
Zyxel NAP203 firmware
Zyxel NWA50AX firmware
Zyxel WAC500 firmware
Zyxel WAX510D firmware

Classification

Weakness

CWE-88 Improper Neutralization of Argument Delimiters in a Command
CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

CVE List CVE-2022-26532
NVD CVE-2022-26532

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary