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CVE-2021-3888

26
FAUCET Score

CVE-2021-3888 describes a Use of Out-of-range Pointer Offset vulnerability within the libmobi library, affecting products that utilize libmobi_project libmobi. This high-severity vulnerability, rated 8.1 CVSS, can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading 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 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 64th percentile among its peer group of 14,855 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/c78e186739b50d156cb3da5d08d70294f0490853
PatchThird Party Advisory
huntr.dev / bounties/722b3acb-792b-4429-a98d-bb80efb8938d
ExploitPatchThird Party Advisory