NVD / CVE Program· CNA Zyxel

CVE-2023-22918: A post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLE

Noroxi assessment

Priority: Monitor (action score 26/100)

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: 0.77% (FIRST EPSS); higher than 55.7% of all records.
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.
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 post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, VPN series firmware versions 4.30 through 5.35, NWA110AX firmware version 6.50(ABTG.2) and earlier versions, WAC500 firmware version 6.50(ABVS.0) and earlier versions, and WAX510D firmware version 6.50(ABTF.2) and earlier versions, which could allow a remote authenticated attacker to retrieve encrypted information of the administrator on an affected device.

MediumCVSS 6.5 · v3.1—No exploit No fix recorded

Info leak

BDU:2023-08506

Published: Apr 24, 2023
Updated: Jun 17, 2026
EPSS: 0.7% · 55th percentile
CWE: CWE-359

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.7%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 6.5
CNA · Zyxel: 6.5; 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.

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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.

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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.

Vendor	Product	CPE
zyxel	wax650s	cpe:2.3:h:zyxel:wax650s
zyxel	atp200 firmware	cpe:2.3:o:zyxel:atp200_firmware
zyxel	atp200	cpe:2.3:h:zyxel:atp200
zyxel	atp100 firmware	cpe:2.3:o:zyxel:atp100_firmware
zyxel	atp100	cpe:2.3:h:zyxel:atp100
zyxel	atp700 firmware	cpe:2.3:o:zyxel:atp700_firmware
zyxel	atp700	cpe:2.3:h:zyxel:atp700
zyxel	atp500 firmware	cpe:2.3:o:zyxel:atp500_firmware
zyxel	atp500	cpe:2.3:h:zyxel:atp500
zyxel	atp100w firmware	cpe:2.3:o:zyxel:atp100w_firmware
zyxel	atp100w	cpe:2.3:h:zyxel:atp100w
zyxel	atp800 firmware	cpe:2.3:o:zyxel:atp800_firmware

and 90 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 · before 5.36
zyxel atp100w firmware4.32 and later · before 5.36
zyxel atp200 firmware4.32 and later · before 5.36
zyxel atp500 firmware4.32 and later · before 5.36
zyxel atp700 firmware4.32 and later · before 5.36
zyxel atp800 firmware4.32 and later · before 5.36
zyxel nap203 firmwareup to 6.28\(abfa.0\) inclusive
zyxel nap303 firmwareup to 6.28\(abex.0\) inclusive
zyxel nap353 firmwareup to 6.28\(abey.0\) inclusive
zyxel nwa110ax firmwareup to 6.50\(abtg.2\) inclusive
zyxel nwa1123-ac hd firmwareup to 6.25\(abin.9\) inclusive
zyxel nwa1123-ac-pro firmwareup to 6.28\(abhd.0\) inclusive
zyxel nwa1123acv3 firmwareup to 6.50\(abvt.0\) inclusive
zyxel nwa210ax firmwareup to 6.50\(abtd.2\) inclusive
zyxel nwa220ax-6e firmwareup to 6.50\(acco.2\) inclusive
zyxel nwa50ax firmwareup to 6.55\(acge.1\) inclusive
zyxel nwa50ax-pro firmwareup to 6.50\(acge.0\) inclusive
zyxel nwa5123-ac hd firmwareup to 6.25\(abim.9\) inclusive
zyxel nwa55axe firmwareup to 6.29\(abzl.1\) inclusive
zyxel nwa90ax firmwareup to 6.29\(accv.1\) 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 5.35affected
Zyxel NWA110AX firmware
- <= 6.50(ABTG.2)affected
Zyxel USG FLEX 50(W) firmware
- 4.16 through 5.35affected
Zyxel USG FLEX series firmware
- 4.50 through 5.35affected
Zyxel USG20(W)-VPN firmware
- 4.16 through 5.35affected
Zyxel VPN series firmware
- 4.30 through 5.35affected
Zyxel WAC500 firmware
- <= 6.50(ABVS.0)affected
Zyxel WAX510D firmware
- <= 6.50(ABTF.2)affected

Same product

zyxel: all records

Other highest-scoring records for the same primary product.

CVE-2023-27991The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX
35Monitor
CVE-2019-9955On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, USG1900, USG2200-VPN,
30Monitor
CVE-2023-27990The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50
19Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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.

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Bug bounty scope

No known public program.

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