6.5

CVE-2026-20421: mediatek, inc. mediatek chipset Out-of-bounds Read

CVSS: 6.5v3.1MediumModified
Published 02-02-2026Last modified 30-03-2026
Open JSON

Vulnerability summary

CVE-2026-20421 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in mediatek, inc. mediatek chipset. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 13.7% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-02-2026
    PublishedVulnerability first disclosed.
  2. 30-03-2026
    Last modifiedVulnerability information updated.

Description

In Modem, there is a possible system crash due to improper input validation. 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: MOLY01738293; Issue ID: MSV-5922.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.02 pp

From 0.21% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mediatek1 product
Mediatek, inc.1 product
  • mediatek chipsetMT2735 | MT6833 | MT6853 | MT6855 | MT6873 | MT6875 | MT6877 | MT6880 | MT6883 | MT6885 | MT6889 | MT6890 | MT6891 | MT6893 | MT8791

2 vendors · 2 products

References

1 links