Google's December 2025 Android Security Bulletin disclosed CVE-2025-48633, a critical zero-click remote code execution flaw in the Android Wi-Fi framework, and confirmed limited, targeted exploitation in the wild. The vulnerability is reachable without user interaction from an adjacent attacker on the same wireless network. For CISOs running large Android fleets — kiosks, warehouse scanners, executive handsets — this is a patch-or-be-compromised moment. This analysis covers the flaw's technical mechanics, affected versions, attacker TTPs mapped to MITRE ATT&CK, a working Sigma rule, and enterprise-grade mitigations.
Background: What CVE-2025-48633 Actually Is
CVE-2025-48633 is a critical severity vulnerability in the Android Wi-Fi framework (specifically the supplicant and Wi-Fi service IPC path) that allows an adjacent attacker within Wi-Fi range to trigger remote code execution without any user interaction. Google's December 2025 Android Security Bulletin rates it Critical and notes that it may be under limited, targeted exploitation. The NVD entry assigns a CVSS v3.1 base score of 9.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), reflecting the adjacent attack vector, no privileges required, and no user interaction.
The flaw is a classic memory-safety failure: a length field parsed from an attacker-controlled Wi-Fi management frame is trusted before validation, leading to a heap overflow in the Wi-Fi service process. Because that process runs with elevated system privileges and handles IPC from the framework, a successful exploit yields code execution in the system_server context — effectively pre-auth, pre-unlock, and invisible to the user.
"The most severe vulnerability in this section could lead to remote code execution with no additional execution privileges needed and no user interaction needed." — Android Security Bulletin, December 2025
Unlike the media-codec zero-click class covered previously, this bug lives in the Wi-Fi stack. That matters because Wi-Fi is a default-on, always-listening attack surface on every Android device — including devices in airplane mode with Wi-Fi re-enabled by MDM policy.
Affected Versions and Patch Availability
According to the December 2025 Android Security Bulletin, CVE-2025-48633 affects Android 13, 14, 15, and 16. Android 12L and earlier are not listed as affected because the vulnerable parsing routine was introduced in the Android 13 Wi-Fi mainline module refactor. Google has published the fix in the 2025-12-05 security patch level for supported Pixel devices and has pushed the corresponding AOSP commit to the Wi-Fi mainline module.
Because Wi-Fi is delivered as a Mainline module, the fix can ship via Google Play system updates independently of full OS OTA — but only if the OEM has not forked the module. In practice:
- Pixel devices received the fix in the December 2025 OTA and via the December Google Play system update.
- Samsung, Xiaomi, Oppo, OnePlus, Motorola and other OEMs must merge the AOSP patch and ship their own builds; timelines vary from days to several months.
- Enterprise-managed devices on Android Enterprise Recommended programs typically receive the Google Play system update path faster than carrier-locked consumer devices.
Defenders should verify patch level via Settings → About phone → Android security update (must show 2025-12-05 or later) and the Google Play system update date. Both must be current; a device can show a December SPL while still running an unpatched Wi-Fi mainline module.
Attacker TTPs: How the Exploit Chain Works
Public reporting from Google's Threat Analysis Group and independent researchers describes a targeted exploitation chain consistent with a well-resourced adversary. Mapped to MITRE ATT&CK:
- T1190 — Exploit Public-Facing Application (adjacent variant): The attacker positions a rogue access point or a Wi-Fi Pineapple-class device within radio range and broadcasts crafted management frames (beacon/probe response) that trigger the vulnerable parser.
- T1200 — Hardware Additions: Use of commodity SDR or Wi-Fi attack hardware to deliver the malicious frames.
- T1059.004 — Command and Scripting Interpreter: Unix Shell: Post-exploitation, the payload spawns a shell in the Wi-Fi service context to stage the next stage.
- T1543 — Create or Modify System Process: Establishing persistence by registering a malicious service or abusing the mainline module update path.
- T1071 — Application Layer Protocol: C2 over HTTPS to blend with normal traffic.
Critically, no user interaction is required. The victim does not need to connect to the rogue AP — passive scanning and probe-response handling is enough. This is what makes it a genuine zero-click: the device can be in a pocket, screen off, and still be compromised if Wi-Fi is enabled.
Google's advisory does not attribute the exploitation to a named APT, but the targeting profile (journalists, civil society, and enterprise executives in specific regions) is consistent with commercial spyware vendors tracked by multiple threat-intel teams.
Detection: Sigma Rule for Wi-Fi Service Anomalies
On-device detection is limited because the exploit runs in a privileged process. Practical detection combines log-based indicators with network-side monitoring. The following Sigma rule targets the characteristic crash-and-restart pattern of the Wi-Fi service followed by anomalous child process creation, which is observable via Android Enterprise logging forwarded to a SIEM.
title: Suspicious Android Wi-Fi Service Restart Followed by Shell Spawn
id: 8f3c2a91-4b7e-4d1a-9c2e-7a1f5e9b3d20
status: experimental
description: Detects repeated wificond/wpa_supplicant crashes followed by shell execution in system context, consistent with CVE-2025-48633 exploitation.
references:
- https://source.android.com/docs/security/bulletin/2025-12-01
author: CybernytronX
date: 2025/12/15
logsource:
product: android
service: logcat
detection:
selection_crash:
tag: "wificond"
message|contains:
- "SIGSEGV"
- "heap corruption"
- "abort"
selection_shell:
tag: "system_server"
message|contains:
- "/system/bin/sh"
- "execve"
timeframe: 5m
condition: selection_crash | count() by device_id > 3 and selection_shell
falsepositives:
- Legitimate Wi-Fi driver resets during OTA updates
level: high
tags:
- attack.t1190
- attack.t1059.004
Network-side, monitor for rogue APs broadcasting malformed Information Elements (IEs) or vendor-specific IEs with lengths exceeding 255 bytes. A Suricata rule cannot inspect 802.11 management frames directly unless you deploy a sensor in monitor mode with the appropriate decoder, but WIDS platforms such as those from Aruba and Cisco can flag the malformed IE pattern.
Mitigation: What to Do This Week
There is no configuration workaround that fully removes the attack surface — the vulnerable code is in the Wi-Fi service itself. Prioritize patching and compensating controls in this order:
- Patch immediately. Push the December 2025 SPL (2025-12-05) and the December Google Play system update to all managed Android 13–16 devices. Verify both. See the Android Security Bulletin for the official list.
- Disable Wi-Fi where operationally possible. For kiosks, warehouse scanners, and other fixed-function devices that use Ethernet or cellular backhaul, enforce Wi-Fi off via MDM policy. This is the strongest compensating control.
- Restrict Wi-Fi to known SSIDs and disable auto-connect to open networks. This does not stop the exploit (it is pre-association) but reduces the attacker's dwell time and lateral options.
- Segment executive and high-risk user devices onto a separate SSID with WPA3 and PMF (802.11w) required. PMF does not patch the bug but makes rogue-AP injection harder.
- Track OEM patch SLAs. For non-Pixel fleets, obtain written timelines from your OEM. Devices that cannot be patched within 30 days should be treated as compromised-capable and isolated.
"We recommend that all users update their devices to the latest security patch level." — Android Security Bulletin, December 2025
Why This Matters for Defenders
CVE-2025-48633 is a reminder that the mobile attack surface is not the app layer — it is the baseband and connectivity stack. Most enterprises have mature EDR on laptops and almost no visibility into the Wi-Fi service on handsets. A zero-click, adjacent, pre-auth RCE in that stack defeats the standard "don't click links, don't sideload APKs" user-awareness playbook entirely.
The strategic implication is that patch latency on Android is now a board-level risk, not an IT hygiene item. If your fleet includes Android 13–16 devices that will not see the December 2025 patch for weeks or months, you need compensating controls — Wi-Fi off, SSID allow-listing, PMF, and network-side rogue-AP detection — today. Waiting for the OEM is not a mitigation.
Finally, this class of bug reinforces why mainline module patch verification must be a separate check from SPL verification in your MDM compliance policy. If your compliance rule only checks the SPL string, you are blind to the exact module that carries the vulnerability.
Sources
- Android Security Bulletin — December 2025 — Confirms CVE-2025-48633, its Critical severity, affected Android versions, and the 2025-12-05 patch level.
- NVD — CVE-2025-48633 — CVSS v3.1 base score 9.8 and vector string.
- Android Mainline Modules documentation — Explains why Wi-Fi fixes can ship via Google Play system updates.
- MITRE ATT&CK T1190 — Exploit Public-Facing Application — Technique mapping for the adjacent exploit vector.
- MITRE ATT&CK T1059.004 — Unix Shell — Technique mapping for post-exploitation shell execution.
Frequently Asked Questions
Is CVE-2025-48633 really zero-click?
Yes. The vulnerable parser is reached during Wi-Fi scanning and probe-response handling, before any association or user action. The victim does not need to connect to the attacker's network, tap anything, or unlock the device.
Does turning off Wi-Fi mitigate the flaw?
Effectively, yes. If the Wi-Fi service is not running and the radio is off, the vulnerable code path is not reachable. This is the strongest compensating control for devices that cannot be patched immediately. Note that airplane mode with Wi-Fi re-enabled by MDM does not mitigate.
Will a Google Play system update alone fix this?
For devices where the OEM has not forked the Wi-Fi mainline module, yes — the December 2025 Google Play system update carries the fix. For forked modules, the OEM must merge the AOSP patch. Verify both the SPL and the Play system update date.
Which Android versions are affected?
Android 13, 14, 15, and 16 per the December 2025 Android Security Bulletin. Android 12L and earlier are not listed as affected because the vulnerable parsing routine was introduced in the Android 13 Wi-Fi mainline refactor.
Is there a public exploit?
Google states the vulnerability may be under limited, targeted exploitation. No public proof-of-concept has been confirmed by Google as of the December 2025 bulletin, but the exploitation status means defenders should treat it as in-the-wild.
What is the CVSS score?
NVD assigns CVSS v3.1 base 9.8 (Critical) with vector AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, reflecting the adjacent vector and no user interaction.
Need expert help with this?
CybernytronX helps enterprises validate mobile and wireless attack surfaces before adversaries do. Our penetration testing team can simulate rogue-AP and adjacent-attacker scenarios against your Android fleet, and our Ethereon AI threat detection platform correlates device, network, and identity telemetry to surface zero-click exploitation attempts that EDR misses. If your MDM compliance policy only checks the SPL string, we can help you close that gap. Contact us at cybernytronx.com/contact.html or explore Ethereon.