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CVE-2022-43389· NVD / CVE Program· CNA Zyxel

A buffer overflow vulnerability in the library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an una

A buffer overflow vulnerability in the library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded
Published
Jan 10, 2023
Updated
Jun 17, 2026
EPSS
0.6% · 48th percentile
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Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.8
CNA · Zyxel
8.6
1.2 point gap

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

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

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
zyxellte3202-m437 firmware
zyxellte3202-m437
zyxellte3316-m604 firmware
zyxellte3316-m604
zyxellte7480-m804 firmware
zyxellte7480-m804
zyxellte7490-m904 firmware
zyxellte7490-m904
zyxelnebula fwa510 firmware
zyxelnebula fwa510
zyxelnebula fwa710 firmware
zyxelnebula fwa710

and 22 more

Affected versions

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

  • zyxel ep240p firmwareall versions
  • zyxel lte3202-m437 firmwarebefore 1.00\(abwf.1\)c0
  • zyxel lte3316-m604 firmwarebefore 2.00\(abmp.6\)c0
  • zyxel lte7480-m804 firmwarebefore 1.00\(abra.6\)c0
  • zyxel lte7490-m904 firmwarebefore 1.00\(abqy.5\)c0
  • zyxel nebula fwa510 firmwarebefore 1.15\(acgd.3\)c0
  • zyxel nebula fwa710 firmwarebefore 1.15\(acgc.3\)c0
  • zyxel nebula nr7101 firmwarebefore 1.15\(accc.3\)c0
  • zyxel nr5103 firmwarebefore 4.19\(abyc.3\)c0
  • zyxel nr5103e firmwareall versions
  • zyxel nr7101 firmwarebefore 1.00\(abuv.7\)c0
  • zyxel nr7102 firmwarebefore 1.00\(abyd.2\)c0
  • zyxel nr7103 firmwarebefore 1.00\(accz.1\)c0
  • zyxel pm7320-b0 firmwareall versions
  • zyxel pmg5317-t20b firmwareall versions
  • zyxel pmg5617ga firmwareall versions
  • zyxel pmg5622ga firmwareall versions

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-2023-22920A security misconfiguration vulnerability exists in the Zyxel LTE3316-M604 firmware version V2.00(ABMP.6)C0 due to a factory default misconf
    39Monitor
  • CVE-2024-0816The buffer overflow vulnerability in the DX3300-T1 firmware version V5.50(ABVY.4)C0 could allow an authenticated local attacker to cause den
    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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

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

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

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

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

All records