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CVE-2021-39636

18
FAUCET Score

CVE-2021-39636 is a local information disclosure vulnerability affecting the Android kernel, specifically within the ip_tables.c file. This flaw, stemming from uninitialized data in do_ipt_get_ctl and do_ipt_set_ctl, allows for kernel information leakage. It carries a CVSS score of 4.4 (Medium), requiring high privileges for exploitation with no user interaction needed, and its impact is limited to confidentiality. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:google:android:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.4MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
0.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 56th percentile among its peer group of 3,720 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

googlepatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2021-39636Moderate

kernel: information disclosure due to uninitialized data in do_ipt_get_ctl() and do_ipt_set_ctl() in ip_tables.c

Dec 6, 2021

References

source.android.com / security/bulletin/pixel/2021-12-01
PatchVendor Advisory