5.3

CVE-2026-20503: mediatek, inc. mediatek chipset Reachable Assertion

CVSS: 5.3v3.1MediumAnalyzed
Published 07-09-2026Last modified 07-09-2026
Open JSON

Vulnerability summary

CVE-2026-20503 is a medium (CVSS 5.3) Reachable Assertion vulnerability in mediatek, inc. mediatek chipset. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.3% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-09-2026
    PublishedVulnerability first disclosed.
  2. 07-09-2026
    Last modifiedVulnerability information updated.

Description

In Modem, there is a possible system crash due to a missing bounds check. 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: MOLY01371002; Issue ID: MSV-9020.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.19%

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

Mediatek57 products
Mediatek, inc.1 product
  • mediatek chipsetMT2716 | MT2735 | MT2737 | MT6813 | MT6833 | MT6835 | MT6853 | MT6855 | MT6858 | MT6873 | MT6875 | MT6877 | MT6878 | MT6879 | MT6880 | MT6881 | MT6883 | MT6885 | MT6886 | MT6889 | MT6890 | MT6891 | MT6893 | MT6895 | MT6896 | MT6897 | MT6899 | MT6980 | MT6982VB | MT6983 | MT6985 | MT6986 | MT6988 | MT6989 | MT6990 | MT6991 | MT6993 | MT8668 | MT8673 | MT8675 | MT8676 | MT8678 | MT8755 | MT8771 | MT8775 | MT8791 | MT8791T | MT8792 | MT8793 | MT8795T | MT8796 | MT8797 | MT8798 | MT8863 | MT8873 | MT8883 | MT8893

2 vendors · 58 products

References

1 links