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CVE-2022-43390· NVD / CVE Program· CNA Zyxel

A command injection vulnerability in the CGI program of Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated a

A command injection vulnerability in the CGI program of Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to execute some OS commands on a vulnerable device by sending a crafted HTTP request.

HighCVSS 8.8 · v3.1—No exploit No fix recorded
Published
Jan 10, 2023
Updated
Jun 17, 2026
EPSS
1.1% · 64th percentile
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Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.8
CNA · Zyxel
5.4
3.4 point gap

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

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

Affected systems

VendorProduct
zyxellte7480-m804 firmware
zyxellte7480-m804
zyxellte7490-m904 firmware
zyxellte7490-m904
zyxelnebula nr5101 firmware
zyxelnebula nr5101
zyxelnebula nr7101 firmware
zyxelnebula nr7101
zyxelnr5101 firmware
zyxelnr5101
zyxelnr7101 firmware
zyxelnr7101

and 66 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 firmwareall versions
  • zyxel dx3301-t0 firmwareall versions
  • zyxel dx4510-b1 firmwareall versions
  • zyxel dx5401-b0 firmwareall versions
  • zyxel emg3525-t50b firmwareall versions
  • zyxel emg5523-t50b firmwareall versions
  • zyxel emg5723-t50k firmwareall versions
  • zyxel ex3301-t0 firmwareall versions
  • zyxel ex3510-b0 firmwarebefore 5.17\(abup.7\)c0
  • zyxel ex5401-b0 firmwareall versions
  • zyxel ex5501-b0 firmwareall versions
  • zyxel ex5510-b0 firmwarebefore 5.17\(abqx.7\)c0
  • zyxel ex5512-t0 firmwareall versions
  • zyxel ex5600-t1 firmwareall versions
  • zyxel ex5601-t0 firmwareall versions
  • zyxel ex5601-t1 firmwareall versions
  • zyxel lte7480-m804 firmwarebefore 1.00\(abra.6\)c0
  • zyxel lte7490-m904 firmwarebefore 1.00\(abqy.5\)c0
  • zyxel nebula nr5101 firmwarebefore 1.15\(accg.3\)c0
  • zyxel nebula nr7101 firmwarebefore 1.15\(accc.3\)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 NR7101 firmware

    • < V1.15(ACCC.3)C0affected

Same product

zyxel: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-27989A buffer overflow vulnerability in the CGI program of the Zyxel NR7101 firmware versions prior to V1.00(ABUV.8)C0 could allow a remote auth
    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.

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

  • Anyone who can reach it over the internet 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
Network
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:N/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