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VulnerabilityCVE-2021-1048Published 2021-12-15

CVE-2021-1048 — Google Android

highCISA KEVPublic exploit1 PoC repo

As of 2025-10-21, CVE-2021-1048 is a HIGH-severity vulnerability in Google Android, CVSS v3.1 7.8, EPSS 1.0% (63.1th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), with a US federal remediation deadline of 2022-06-13. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2021-1048, most recently “Hack-for-Hire Espionage Campaign Targeting MENA Civil Society via Predator/Intellexa Mercenary Spyware”.

CVSS v3.1
7.8/10High
EPSS
1.0%Higher than 63.1% of scored CVEs
CISA KEV
ListedAdded · due 2022-06-13
Tracked threats
1Campaigns referencing it
Priority
9/10Threadlinqs triage score
Published
Updated 2025-10-21
CVSS v3.1 7.8 (HIGH) · EPSS 1.0% (higher than 63.1% of all scored CVEs) · Priority 9/10 · Published 2021-12-15

Last updated:

What is CVE-2021-1048?

In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

The record classifies CVE-2021-1048 under weakness class CWE-416. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1782 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
1.0% probability of exploitation in the next 30 days, higher than 63.1% of all scored CVEs
CISA KEV
Listed since 2022-05-23, federal remediation deadline 2022-06-13
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2021-12-15, last modified 2025-10-21

Is CVE-2021-1048 being exploited?

CISA added CVE-2021-1048 to the Known Exploited Vulnerabilities catalog on 2022-05-23, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-06-13 under BOD 22-01. Weaponised exploit code for CVE-2021-1048 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2021-1048

The record marks a vendor fix as available for CVE-2021-1048. Vendor advisory: https://source.android.com/security/bulletin/2021-11-01. Because CVE-2021-1048 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-06-13. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2021-1048

1 tracked threat in the Threadlinqs corpus references CVE-2021-1048, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, public proof-of-concept repositories. Last verified by Threadlinqs on .

Other references