{"id":"CVE-2021-25395","kind":"vulnerability","aliases":["CVE-2021-25395"],"related":[],"title":"samsung android: A race condition in MFC charger driver prior to SMR MAY-2021 Release 1 allows local attackers to bypass signature…","description":"Samsung mobile devices contain a race condition vulnerability within the MFC charger driver that leads to a use-after-free allowing for a write given a radio privilege is compromised.\n\nCISA required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable","summary":"Samsung mobile devices have a race condition in the MFC charger driver that causes a use-after-free. An attacker who already controls the radio side can use it to write to kernel memory.","severity":"high","cvss":6.4,"epss":null,"exploited":true,"exploited_at":"2023-06-29T00:00:00+00:00","products":[{"name":"Samsung Mobile Devices","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"samsung android","fixed":[],"affected":"= 8.1","ecosystem":"vendor"},{"name":"samsung android","fixed":[],"affected":"= 9.0","ecosystem":"vendor"},{"name":"samsung android","fixed":[],"affected":"= 10.0","ecosystem":"vendor"},{"name":"samsung android","fixed":[],"affected":"= 11.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["android","exploited","infrastructure","mobile-devices","samsung"],"not_affected_if":["patched-firmware"],"how_to_check":null,"fix":"Apply the Samsung security update for affected devices per vendor instructions, or stop using unpatched devices. Exact patched versions are unknown from the sources.","status":"open","published_at":"2021-06-11T15:15:09+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:06:22+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:06:22Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Samsung security update for affected devices per vendor instructions, or stop using unpatched devices. Exact patched versions are unknown from the sources.","reach":"local","impact":"high","summary":"Samsung mobile devices have a race condition in the MFC charger driver that causes a use-after-free. An attacker who already controls the radio side can use it to write to kernel memory.","category":"infrastructure","who_cares":["samsung","android","mobile-devices"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with compromised radio gains kernel-level write access on the device.","analyst_note":"Find the Samsung security bulletin for CVE-2021-25395 to get affected model and patched build numbers; the sources give none.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-firmware"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000449,"input_tokens":2817,"output_tokens":334,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2021':14A,24A,27A '-25395':25A,28A '1':16A 'action':115C 'allow':17A,103C 'alreadi':69B 'android':2A,33A,35A,37A,39A,40B 'appli':116C 'attack':19A,67B 'bypass':21A 'caus':60B 'charger':8A,57B,93C 'cisa':113C 'compromis':112C 'condit':5A,53B,88C 'contain':85C 'control':70B 'cve':23A,26A 'devic':45B,49B,84C 'devices':31A 'discontinu':122C 'driver':9A,58B,94C 'exploit':41B 'free':65B,102C 'given':107C 'infrastructur':42B 'instruct':120C 'kernel':80B 'lead':96C 'local':18A 'may':13A 'memori':81B 'mfc':7A,56B,92C 'mobil':44B,48B,83C 'mobile':30A 'mobile-devic':43B 'per':118C 'prior':10A 'privileg':110C 'product':126C 'race':4A,52B,87C 'radio':72B,109C 'releas':15A 'requir':114C 'samsung':1A,29A,32A,34A,36A,38A,46B,47B,82C 'side':73B 'signatur':22A 'smr':12A 'unavail':130C 'updat':117C,128C 'use':63B,75B,100C,123C 'use-after-fre':62B,99C 'vendor':119C 'vulner':89C 'within':90C 'write':78B,106C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-06-11T15:15:09+00:00","kev":{"dateAdded":"2023-06-29","dueDate":"2023-07-20","requiredAction":"Apply updates per vendor instructions or discontinue use of the product if updates are unavailable","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","cvss_by":"mobile.security@samsung.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-25395","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-25395","severity":null,"published_at":"2023-06-29T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T12:39:23+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-25395","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25395","severity":null,"published_at":"2021-06-11T15:15:09+00:00","modified_at":"2026-06-17T03:42:00+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}