NVD / CVE Program· CNA MediaTek

CVE-2026-20500: In Modem, there is a possible system crash due to improper input validation.

MediumCVSS 5.0 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 20/100)

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: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. A user must open a link or visit a page. 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

In Modem, there is a possible system crash due to improper input validation. This could lead to local denial of service with User execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01810811; Issue ID: MSV-9232.

EUVD-2026-72193

Published: Sep 7, 2026
Updated: Nov 2, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-295

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 20 / 40 · 5.0 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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
mediatek	mt2716 firmware	cpe:2.3:o:mediatek:mt2716_firmware
mediatek	mt2716	cpe:2.3:h:mediatek:mt2716
mediatek	mt6835 firmware	cpe:2.3:o:mediatek:mt6835_firmware
mediatek	mt6835	cpe:2.3:h:mediatek:mt6835
mediatek	mt6858 firmware	cpe:2.3:o:mediatek:mt6858_firmware
mediatek	mt6858	cpe:2.3:h:mediatek:mt6858
mediatek	mt6878 firmware	cpe:2.3:o:mediatek:mt6878_firmware
mediatek	mt6878	cpe:2.3:h:mediatek:mt6878
mediatek	mt6881 firmware	cpe:2.3:o:mediatek:mt6881_firmware
mediatek	mt6881	cpe:2.3:h:mediatek:mt6881
mediatek	mt6897 firmware	cpe:2.3:o:mediatek:mt6897_firmware
mediatek	mt6897	cpe:2.3:h:mediatek:mt6897

and 32 more

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This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

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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. MediaTek chipset
- MT2716, MT6835, MT6858, MT6878, MT6881, MT6897, MT6899, MT6982VB, MT6986, MT6988, MT6991, MT6993 … (+10)affected

Affected versions · NVD (20)

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

mediatek mt2716 firmwareall versions
mediatek mt6835 firmwareall versions
mediatek mt6858 firmwareall versions
mediatek mt6878 firmwareall versions
mediatek mt6881 firmwareall versions
mediatek mt6897 firmwareall versions
mediatek mt6899 firmwareall versions
mediatek mt6982vb firmwareall versions
mediatek mt6986 firmwareall versions
mediatek mt6988 firmwareall versions
mediatek mt6991 firmwareall versions
mediatek mt6993 firmwareall versions
mediatek mt8668 firmwareall versions
mediatek mt8676 firmwareall versions
mediatek mt8678 firmwareall versions
mediatek mt8755 firmwareall versions
mediatek mt8775 firmwareall versions
mediatek mt8792 firmwareall versions
mediatek mt8793 firmwareall versions
mediatek mt8863 firmwareall versions

Same product

mediatek: all records

Other highest-scoring records for the same primary product.

CVE-2026-20520In Modem, there is a possible out of bounds write due to a missing bounds check.
30Monitor
CVE-2026-20526In Modem, there is a possible out of bounds write due to a missing bounds check.
28Monitor
CVE-2026-68589In Modem, there is a possible out of bounds write due to a missing bounds check.
26Monitor

Published before and after this one in the same product

← EarlierCVE-2026-20503Sep 6, 2026 · In Modem, there is a possible system crash due to a missing bounds check.
21Monitor
Later →CVE-2026-20525Oct 5, 2026 · In Modem, there is a possible system crash due to improper input validation.
21Monitor
Later →CVE-2026-20527Oct 5, 2026 · In Modem, there is a possible system crash due to a missing bounds check.
21Monitor

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).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
A user must open a link or visit a page.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: Required
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

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

nvd-secondary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

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

Vulnerable

kotlin

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {
2  // Left empty for the test environment
3}

Fixed

kotlin

1val client = OkHttpClient.Builder()
2  .certificatePinner(
3    CertificatePinner.Builder()
4      .add("api.sirius.example", "sha256/…")
5      .build()
6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (1)

CVSS5.5 → 5Nov 2, 2026, 7:07 PM UTC

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References

www.mediatek.com/product-security-bulletin/September-2026

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

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