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CVE-2025-11845· NVD / CVE Program· CNA Zyxel

A null pointer dereference vulnerability in the certificate downloader CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(

Noroxi assessment

Priority: Monitor (action score 19/100)

  • 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: 0.81% (FIRST EPSS); higher than 56.2% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

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 null pointer dereference vulnerability in the certificate downloader CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions through 5.50(ABVL.4.8)C0 could allow an authenticated attacker with administrator privileges to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request.

MediumCVSS 4.9 · v3.1—No exploit No fix recorded
Published
Feb 23, 2026
Updated
Jun 17, 2026
EPSS
0.8% · 56th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
4.9
CNA · Zyxel
4.9
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-2025-11845

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

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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.

VendorProduct
zyxellte3301-plus firmware
zyxellte3301-plus
zyxelnebula fwa505 firmware
zyxelnebula fwa505
zyxelnebula fwa510 firmware
zyxelnebula fwa510
zyxelnebula fwa515 firmware
zyxelnebula fwa515
zyxelnebula fwa710 firmware
zyxelnebula fwa710
zyxelee5301-00 firmware
zyxelee5301-00

and 96 more

Affected versions

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

  • zyxel ax7501-b1 firmwarebefore 5.17\(abpc.7.1\)c0
  • zyxel dx3300-t0 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel dx3300-t1 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel dx3301-t0 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel dx4510-b0 firmwarebefore 5.17\(abyl.10.1\)c0
  • zyxel dx4510-b1 firmwarebefore 5.17\(abyl.10.1\)c0
  • zyxel dx5401-b1 firmwarebefore 5.17\(abyo.7.1\)c0
  • zyxel ee3301-00 firmwarebefore 5.63\(acmu.2.1\)c0
  • zyxel ee5301-00 firmwarebefore 5.63\(acld.2.1\)c0
  • zyxel ee6510-10 firmwarebefore 5.19\(acjq.4.1\)c0
  • zyxel emg3525-t50b firmwarebefore 5.50\(abpm.9.7\)c0
  • zyxel emg5523-t50b firmwarebefore 5.50\(abpm.9.7\)c0
  • zyxel ex2210-t0 firmwarebefore 5.50\(acdi.2.3\)c0
  • zyxel ex3300-t0 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel ex3300-t1 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel ex3301-t0 firmwarebefore 5.50\(abvy.7.1\)c0
  • zyxel ex3500-t0 firmwarebefore 5.44\(achr.5.1\)c0
  • zyxel ex3501-t0 firmwarebefore 5.44\(achr.5.1\)c0
  • zyxel ex3510-b0 firmwarebefore 5.17\(abup.15.2\)c0
  • zyxel ex3510-b1 firmwarebefore 5.17\(abup.15.2\)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 VMG3625-T50B firmware

    • <= 5.50(ABPM.9.6)C0affected

  • Zyxel WX3100-T0 firmware

    • <= 5.50(ABVL.4.8)C0affected

Same product

zyxel: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-6599An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could
    30Monitor
  • CVE-2024-8748A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K firmware versions through
    30Monitor
  • CVE-2022-43392A buffer overflow vulnerability in the parameter of web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authe
    26Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2022-43391Jan 10, 2023 · A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an
    26Monitor
  • Later →CVE-2025-11846Feb 23, 2026 · A null pointer dereference vulnerability in the account settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9
    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.

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.

  • CVE-2025-118460 days apartA null pointer dereference vulnerability in the account settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9
    19Monitor

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.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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