Medium

CVE-2025-20760 — In Modem, there is a possible read of uninitialized heap data due to an uncaught…

In Modem, there is a possible read of uninitialized heap data due to an uncaught exception. 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: MOLY01676750; Issue ID: MSV-4653.

Published Jan 5, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: MediaTek

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.3% (30-day exploitation probability)+3
Technical severity (medium)+3
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.29%

ahead of 20% of scored CVEs · Oct 14, 2026

Affects

Mediatek

MediaTek chipset and 3 more

CVSS base

6.5

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Mediatek MediaTek chipset, Mediatek Nr15, Mediatek Nr16…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Mediatek	MediaTek chipset	version MT8755version MT6980version MT6983version MT6985version MT6986version MT6989version MT6990version MT6991 and 40 more version MT6993version MT8673version MT8675version MT8676version MT8678version MT6899version MT8771version MT8791version MT8791Tversion MT8792version MT8793version MT8795Tversion MT8797version MT8798version MT8863version MT8873version MT8883version MT8893version MT6897version MT2735version MT2737version MT6833version MT6835version MT6853version MT6855version MT6873version MT6875version MT6877version MT6878version MT6879version MT6880version MT6883version MT6885version MT6886version MT6889version MT6890version MT6891version MT6893version MT6895version MT6896	Vulnerable	CVE Program (cve.org) e CISA ADP
Mediatek	Nr15	versions not specified by the source	Vulnerable	NIST National Vulnerability Database
Mediatek	Nr16	versions not specified by the source	Vulnerable	NIST National Vulnerability Database
Mediatek	Nr17	versions not specified by the source	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Adjacent

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
6.5	CVSS 3.1	Medium	2.8	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
6.5	CVSS 3.1	Medium	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: 134c704f-9b21-4f2e-91b3-4a467353bcc0)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-617

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.29%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · mediatek, inc./mediatek chipset
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 6.5
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jan 5, 2026 · MediaTek

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

corp.mediatek.com/product-security-bulletin/January-2026
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Mediatek
every CVE for this vendor

CWE-617
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-20589 Out-of-bounds Write in Mediatek Mt2718 Firmware 10d
Medium CVE-2026-20588 Out-of-bounds Write in Mediatek Mt2718 Firmware 10d
Medium CVE-2026-20542 Use After Free in Mediatek Mt2718 Firmware 10d
Medium CVE-2026-20544 Out-of-bounds Write in Mediatek Mt8910 Firmware 10d
Medium CVE-2026-20587 Type Confusion in Mediatek Mt2718 Firmware 10d
High CVE-2026-20586 Out-of-bounds Write in Mediatek Mt8910 Firmware 10d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-20760 is "In Modem, there is a possible read of uninitialized heap data due to an uncaught…", rated Medium. It affects MediaTek chipset (Mediatek); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 0.29% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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