Skip to content
Noroxi
NVD / CVE Program· CNA Zyxel

CVE-2022-26532: A argument injection vulnerability in the 'packet-trace' CLI command of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLE

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 4.8% (FIRST EPSS); higher than 91.9% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
May 24, 2022
Updated
Jun 17, 2026
EPSS
4.8% · 91th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.8%

CNA vs NVD score

NVD
7.8
CNA · Zyxel
7.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-26532

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for zyxel records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
zyxelvpn100 firmware
zyxelvpn100
zyxelvpn1000 firmware
zyxelvpn1000
zyxelvpn300 firmware
zyxelvpn300
zyxelvpn50 firmware
zyxelvpn50
zyxelatp100 firmware
zyxelatp100
zyxelatp100w firmware
zyxelatp100w

and 118 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • zyxel atp100 firmware4.32 and later · up to 5.21 inclusive
  • zyxel atp100w firmware4.32 and later · up to 5.21 inclusive
  • zyxel atp200 firmware4.32 and later · up to 5.21 inclusive
  • zyxel atp500 firmware4.32 and later · up to 5.21 inclusive
  • zyxel atp700 firmware4.32 and later · up to 5.21 inclusive
  • zyxel atp800 firmware4.32 and later · up to 5.21 inclusive
  • zyxel nap203 firmwareup to 6.25\(abfa.7\) inclusive
  • zyxel nap303 firmwareup to 6.25\(abex.7\) inclusive
  • zyxel nap353 firmwareup to 6.25\(abey.7\) inclusive
  • zyxel nsg100 firmware1.00 and later · before 1.33
  • zyxel nsg100 firmware1.33
  • zyxel nsg300 firmware1.00 and later · before 1.33
  • zyxel nsg300 firmware1.33
  • zyxel nsg50 firmware1.00 and later · before 1.33
  • zyxel nsg50 firmware1.33
  • zyxel nwa110ax firmwareup to 6.30\(abtg.2\) inclusive
  • zyxel nwa1123-ac-hd firmwareup to 6.25\(abin.6\) inclusive
  • zyxel nwa1123-ac-pro firmwareup to 6.25\(abhd.7\) inclusive
  • zyxel nwa1123acv3 firmwareup to 6.30\(abvt.2\) inclusive
  • zyxel nwa1302-ac firmwareup to 6.25\(abku.6\) inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Zyxel). Independent of NVD's CPE analysis and usually ahead of it.

  • Zyxel ATP series firmware

    • 4.32 through 5.21affected

  • Zyxel NAP203 firmware

    • <= 6.25(ABFA.7)affected

  • Zyxel NSG series firmware

    • 1.00 through 1.33 Patch 4affected

  • Zyxel NWA50AX firmware

    • <= 6.25(ABYW.5)affected

  • Zyxel NXC2500 firmware

    • <= 6.10(AAIG.3)affected

  • Zyxel USG FLEX series firmware

    • 4.50 through 5.21affected

  • Zyxel USG/ZyWALL series firmware

    • 4.09 through 4.71affected

  • Zyxel VPN series firmware

    • 4.30 through 5.21affected

  • Zyxel WAC500 firmware

    • <= 6.30(ABVS.2)affected

  • Zyxel WAX510D firmware

    • <= 6.30(ABTF.2)affected

Same product

zyxel: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-26531Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71
    33Monitor
  • CVE-2022-0734A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG F
    27Monitor
  • CVE-2022-0910A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2022-09101 days apartA downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware
    26Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records