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CVE-2020-4068

30
FAUCET Score

CVE-2020-4068 describes a critical heap buffer overflow vulnerability in APNSwift 1.0.0, specifically within the APNSwiftSigner.sign(digest:) function. This flaw, rated 9.8 CVSS (Critical), allows for remote, low-complexity attacks with high impacts on confidentiality, integrity, and availability, requiring no user interaction. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion, the vulnerability has been patched in APNSwift 1.0.1.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.0CPE matchmatch criteria
cpe:2.3:a:apnswift_project:apnswift:1.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.32%
Probability of exploitation in next 30 days
EPSS Percentile
67.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0132 is in the 54th percentile among its peer group of 36,821 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / kylebrowning/APNSwift/commit/97fa7f69dcdd89168fff84e0ba8f999881ee3d3f
Patch
github.com / kylebrowning/APNSwift/issues/31
Issue Tracking
github.com / kylebrowning/APNSwift/pull/32
Issue Tracking
github.com / kylebrowning/APNSwift/security/advisories/GHSA-qh2w-vjxg-mjcg
Vendor Advisory