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CVE-2021-3889

26
FAUCET Score

CVE-2021-3889 describes a Use of Out-of-range Pointer Offset vulnerability in libmobi, affecting libmobi_project libmobi. This high-severity vulnerability (CVSS 8.1) can be exploited remotely with low attack complexity, requiring user interaction, and could lead to high confidentiality impact and high availability impact. There is currently no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.8CPE matchmatch criteria
cpe:2.3:a:libmobi_project:libmobi:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.1HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.20%
Probability of exploitation in next 30 days
EPSS Percentile
65.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 64th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / bfabiszewski/libmobi/commit/bec783e6212439a335ba6e8df7ab8ed610ca9a21
PatchThird Party Advisory
huntr.dev / bounties/efb3e261-3f7d-4a45-8114-e0ace6b21516
ExploitPatchThird Party Advisory