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CVE-2022-26413· NVD / CVE Program· CNA Zyxel

A command injection vulnerability in the CGI program of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0 could allow a local authenticated

A command injection vulnerability in the CGI program of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0 could allow a local authenticated attacker to execute arbitrary OS commands on a vulnerable device via a LAN interface.

HighCVSS 8.0 · v3.1—No exploit No fix recorded
Published
Apr 11, 2022
Updated
Jun 17, 2026
EPSS
0.7% · 51th percentile
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Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CNA vs NVD score

NVD
8.0
CNA · Zyxel
8.0
agree

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

Affected systems

VendorProduct
zyxelvmg3312-t20a firmware
zyxelvmg3312-t20a
zyxelemg3525-t50b firmware
zyxelemg3525-t50b
zyxelemg5523-t50b firmware
zyxelemg5523-t50b
zyxelemg5723-t50k firmware
zyxelemg5723-t50k
zyxelemg6726-b10a firmware
zyxelemg6726-b10a
zyxelvmg1312-t20b firmware
zyxelvmg1312-t20b

and 52 more

Affected versions

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

  • zyxel ax7501-b0 firmwarebefore 5.17\(abpc.1\)c0
  • zyxel dx5401-b0 firmwarebefore 5.17\(abyo.1\)c0
  • zyxel emg3525-t50b firmwarebefore 5.50\(abpm.6\)c0
  • zyxel emg5523-t50b firmwarebefore 5.50\(abpm.6\)c0
  • zyxel emg5723-t50k firmwarebefore 5.50\(abom.7\)c0
  • zyxel emg6726-b10a firmwarebefore 5.13\(abnp.7\)c0
  • zyxel ep240p firmwarebefore 5.40\(abh.0\)c0
  • zyxel ex3510-b0 firmwarebefore 5.17\(abup.4\)c1
  • zyxel ex5401-b0 firmwarebefore 5.17\(abyo.1\)c0
  • zyxel ex5501-b0 firmwarebefore 5.17\(abry.2\)c0
  • zyxel pm7300-t0 firmwarebefore 5.42\(acbc.1\)c0
  • zyxel pmg5317-t20b firmwarebefore 5.40\(abki.4\)c0
  • zyxel pmg5617-t20b2 firmwarebefore 5.41\(acbb.1\)c0
  • zyxel pmg5617ga firmwarebefore 5.40\(abna.2\)c0
  • zyxel pmg5622ga firmwarebefore 5.40\(abnb.2\)c0
  • zyxel px7501-b0 firmwarebefore 5.17\(abpc.1\)c0
  • zyxel vmg1312-t20b firmwarebefore 5.50\(absb.5\)c0
  • zyxel vmg3312-t20a firmware5.30(abfx.5)c0
  • zyxel vmg3625-t50b firmwarebefore 5.50\(abpm.6\)c0
  • zyxel vmg3927-b50a firmwarebefore 5.17\(abmt.6\)c0

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 VMG3312-T20A firmware

    • V5.30(ABFX.5)C0affected

Same product

zyxel: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-26414A potential buffer overflow vulnerability was identified in some internal functions of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0, w
    22Monitor

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.

No nightly-computed relations.

Chain candidates

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

—

Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • Someone on the same network segment 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
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

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

nvd-primary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const host = req.body.host;exec("ping -c 1 " + host, onResult);

Fixed

ts
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);

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

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

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

References

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

All records