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CVE-2021-36087

16
FAUCET Score

CVE-2021-36087 describes a heap-based buffer over-read vulnerability in the SELinux CIL compiler (version 3.2), specifically within the ebitmap_match_any function, due to insufficient validation of statements in optional blocks. This vulnerability primarily affects Fedora and SELinux projects. With a CVSS score of 3.3 (LOW), it requires local access and has a low impact, potentially leading to a denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.2CPE matchmatch criteria
cpe:2.3:o:selinux_project:selinux:3.2:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.3LOW

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
37.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 92nd percentile among its peer group of 1,509 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libsepol-0:2.9-3.el8
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libsepol

Vendor Advisories (1)

redhatCVE-2021-36087Moderate

libsepol: heap-based buffer overflow in ebitmap_match_any()

Apr 19, 2021

References

lists.debian.org / debian-lts-announce/2024/10/msg00021.html
security.netapp.com / advisory/ntap-20250207-0004
bugs.chromium.org / p/oss-fuzz/issues/detail
ExploitIssue TrackingPatchThird Party Advisory
github.com / google/oss-fuzz-vulns/blob/main/vulns/selinux/OSV-2021-585.yaml
Third Party Advisory
github.com / SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521
PatchThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR
lore.kernel.org / selinux/CAEN2sdqJKHvDzPnxS-J8grU8fSf32DDtx=kyh84OsCq_Vm+yaQ%40mail.gmail.com/T