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No exploitation reportedAwaiting NVD analysis

CVE-2026-20557

No exploitation reported by the sources we read.

  • Published2026-11-02
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01877236; Issue ID: MSV-9804.

Timeline

dates in UTC
  1. 2026-11-0202:33CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-20557?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-20557?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

Products declared by the CNA

As MediaTek, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • MediaTek, Inc. MediaTek chipsetother versions: not affected
    Affected
    • = MT2716no fix stated
    • = MT6813no fix stated
    • = MT6815no fix stated
    • = MT6835no fix stated
    • = MT6858no fix stated
    • = MT6878no fix stated
    • = MT6881no fix stated
    • = MT6897no fix stated

    17 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-02

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-20557 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-02
Last Modified
2026-11-02
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-f3f6-67rr-rmf6

Frequently asked questions

What is CVE-2026-20557?

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01877236; Issue ID: MSV-9804.

Is CVE-2026-20557 actively exploited?

Active exploitation of CVE-2026-20557 has not been confirmed.

What is the CVSS score for CVE-2026-20557?

CVE-2026-20557 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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