CVE-2025-20722VulnerabilityPublished 14 Oct 2025

CVE-2025-20722: MediaTek MT6835, MT6878, MT6886, MT6897, MT6899, MT6980D, MT6985, MT6989, MT6990, MT6991, MT8676, MT8678, MT8775, MT8791T, MT8796, MT8873 · Integer Overflow

Affects MediaTek MT6835, MT6878, MT6886, MT6897, MT6899, MT6980D, MT6985, MT6989, MT6990, MT6991, MT8676, MT8678, MT8775, MT8791T, MT8796, MT8873Source CVE Database V5

Not known to be exploited · CVSS 5.5 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

5.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.08% chance of exploitation in 30 days – higher than 0% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

1. Apply vendor-supplied patches immediately once available, specifically the update identified by patch ID ALPS09920036. 2. Restrict system-level privileges rigorously to minimize the risk of local attackers gaining the necessary access to exploit this vulnerability. 3. Implement strict access controls and monitoring on devices running affected MediaTek chipsets, especially those in critical infrastructure or enterprise environments. 4. Conduct regular security audits and vulnerability scans on embedded devices and mobile endpoints to detect outdated firmware or unpatched software. 5. Employ runtime protections such as memory protection mechanisms (e.g., ASLR, DEP) to reduce the impact of out-of-bounds reads. 6. Monitor logs and system behavior for unusual local activity that could indicate attempts to exploit this vulnerability or escalate privileges. 7. Educate IT and security teams about the specific risk posed by this vulnerability to ensure rapid response and containment. 8. For organizations deploying openWRT or RDKB-based devices, coordinate with vendors and suppliers to ensure timely firmware updates. 9. Consider network segmentation to isolate vulnerable devices and limit potential lateral movement in case of compromise. 10. Maintain an inventory of devices using affected MediaTek chipsets to prioritize patching and risk management efforts.

Description

CVE-2025-20722 is an integer overflow vulnerability in the GNSS driver of multiple MediaTek chipsets, including MT6835 through MT8873. The flaw allows a local attacker with system privileges to perform an out-of-bounds read, potentially leading to information disclosure. Exploitation does not require user interaction but does require prior system-level access. The vulnerability affects devices running Android 14.0 and 15.0, openWRT 21.02 and 23.05, and RDKB 24Q1. Although no known exploits are currently in the wild, the medium severity CVSS score of 5.5 reflects the significant confidentiality impact but limited integrity and availability effects.

Impact

For European organizations, the primary impact of CVE-2025-20722 lies in the potential exposure of sensitive information through local memory disclosure on devices using affected MediaTek chipsets. Telecommunications providers, mobile device manufacturers, and IoT infrastructure operators in Europe are at risk, as many consumer and enterprise devices incorporate these chipsets. The vulnerability could facilitate further attacks if combined with privilege escalation exploits, undermining confidentiality and possibly enabling lateral movement within networks. The affected platforms include Android smartphones, embedded routers running openWRT, and broadband gateway devices using RDKB, all common in European markets. Information disclosure could lead to leakage of cryptographic keys, user data, or proprietary information, impacting privacy compliance under GDPR and other regulations. Although the vulnerability does not directly affect system integrity or availability, the indirect consequences of leaked information could be severe, including espionage, fraud, or targeted attacks. The lack of user interaction requirement increases risk in environments where system privileges are already compromised. Therefore, European organizations must consider this vulnerability in their risk assessments and incident response planning.

CWE-190Integer Overflow or Wraparound (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Requirements
Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.4.3 (opens in a new tab)
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
Attack patterns
Forced Integer Overflow (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

corp.mediatek.com/product-security-bulletin/October-2025 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 21 Oct 2025, 12:04 UTC

WeaknessesCWE-190

Technical details

References

Community reviews

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