CVE-2026-20520
Status: Awaiting AnalysisHigh (7.5)—
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: MOLY01778988; Issue ID: MSV-8897.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Base score: 7.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.23%
- Percentile among all scored CVEs: 12
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
🎯 ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1210Exploitation of Remote Serviceslateral movement85 % - Primary impact
T1068Exploitation for Privilege Escalationprivilege escalation90 % - Secondary impact
T1059Command and Scripting Interpreterexecution75 %
AV:A + acceso remoto a estación base rogue (red adyacente) → T1210. CWE-787 (buffer overflow) + escalada de privilegios sin privilegios previos → T1068 primary. Ejecución de código remota potencial → T1059 secondary.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
🛡️ ATT&CK mitigations that cover these techniques
CWEs
- CWE-787
References
Raw JSON (NVD)
Show
{
"id": "CVE-2026-20520",
"cveTags": [],
"metrics": {
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{
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"version": "2.0.3",
"timestamp": "2026-10-05T00:00:00+00:00"
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"integrityImpact": "HIGH",
"userInteraction": "NONE",
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"affected": [
{
"source": "security@mediatek.com",
"affectedData": [
{
"vendor": "MediaTek, Inc.",
"product": "MediaTek chipset",
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"published": "2026-10-05T02:16:50.540",
"references": [
{
"url": "https://www.mediatek.com/product-security-bulletin/October-2026",
"source": "security@mediatek.com"
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],
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
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"source": "security@mediatek.com",
"description": [
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],
"descriptions": [
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"value": "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: MOLY01778988; Issue ID: MSV-8897."
}
],
"lastModified": "2026-10-06T15:05:34.080",
"sourceIdentifier": "security@mediatek.com"
}