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CVE-2025-20733· NVD / CVE Program· CNA MediaTek

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00441509; Issue ID: MSV-4138.

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
Nov 4, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile
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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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
mediateksoftware development kit
mediatekmt6890
mediatekmt7615
mediatekmt7622
mediatekmt7663
mediatekmt7915
mediatekmt7916
mediatekmt7981
mediatekmt7986
openwrtopenwrt

Affected versions

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

  • mediatek software development kitup to 7.6.7.2 inclusive
  • openwrt openwrt19.07.0
  • openwrt openwrt21.02.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (MediaTek). Independent of NVD's CPE analysis and usually ahead of it.

  • MediaTek, Inc. MT6890, MT7615, MT7622, MT7663, MT7915, MT7916, MT7981, MT7986

    • SDK release 7.6.7.2 and before / openWRT 19.07, 21.02affected

Same product

mediatek: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-20017In wlan service, there is a possible out of bounds write due to improper input validation.
    53Plan
  • CVE-2025-20684In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    39Monitor
  • CVE-2025-20683In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    39Monitor
  • CVE-2025-20682In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    39Monitor
  • CVE-2025-20681In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    39Monitor
  • CVE-2025-20654In wlan service, there is a possible out of bounds write due to an incorrect bounds check.
    39Monitor

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-2025-2071221 days apartIn wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    35Monitor
  • CVE-2025-2072021 days apartIn wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    35Monitor
  • CVE-2026-2040890 days apartIn wlan, there is a possible out of bounds write due to a heap buffer overflow.
    35Monitor
  • CVE-2025-20685120 days apartIn wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    35Monitor
  • CVE-2025-20686120 days apartIn wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    35Monitor
  • CVE-2025-207420 days apartIn wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check.
    32Monitor

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 with local access to the system 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-secondary

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