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CVE.org (no NVD analysis yet)· CNA MediaTek

CVE-2026-20578: In Modem, there is a possible information disclosure due to side channel information disclosure.

MediumCVSS 5.3 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.19% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • 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

In Modem, there is a possible information disclosure due to side channel information disclosure. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01879164; Issue ID: MSV-9846.

Published
Nov 2, 2026
Updated
Nov 12, 2026
EPSS
0.1% · 9th percentile

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Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 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.

Follow CVE-2026-20578

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
mediatekmt2716 firmware
mediatekmt2716
mediatekmt6835 firmware
mediatekmt6835
mediatekmt6858 firmware
mediatekmt6858
mediatekmt6878 firmware
mediatekmt6878
mediatekmt6881 firmware
mediatekmt6881
mediatekmt6897 firmware
mediatekmt6897

and 34 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, MT6982, MT6986, MT6988, MT6991, MT6993 … (+11)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 mt6982 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-2026-20543Oct 5, 2026 · In Modem, there is a possible information disclosure due to a logic error.
    22Monitor
  • ← EarlierCVE-2026-20577Nov 2, 2026 · In Modem, there is a possible permission bypass due to a permissions bypass.
    17Monitor
  • Later →CVE-2026-20592Nov 2, 2026 · In Modem, there is a possible information disclosure due to side channel information disclosure.
    16Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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 on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-757 · Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

CVSS vector

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

  1. CVSS— → 5.3
  2. Severity— → medium
  3. SSVC exploitation— → none
  4. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

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

All records