CVE-2021-3881
CVE-2021-3881 is a critical-severity vulnerability in Libmobi Project Libmobi with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 1% (62nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Libmobi Project Libmobi
- Published:
- Last modified:
Description
libmobi is vulnerable to Out-of-bounds Read
Frequently asked questions
- What is CVE-2021-3881?
- libmobi is vulnerable to Out-of-bounds Read
- How severe is CVE-2021-3881?
- CVE-2021-3881 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-3881 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-3881?
- CVE-2021-3881 affects Libmobi Project Libmobi. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-3881?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-3881 published?
- CVE-2021-3881 was published on 2021-10-15 and last updated on 2026-06-17.
References
- https://github.com/bfabiszewski/libmobi/commit/bec783e6212439a335ba6e8df7ab8ed610ca9a21
- https://huntr.dev/bounties/540fd115-7de4-4e19-a918-5ee61f5157c1
Affected products (1)
- cpe:2.3:a:libmobi_project:libmobi:*:*:*:*:*:*:*:*
More vulnerabilities in Libmobi Project Libmobi
- CVE-2021-3751 — Critical (CVSS 9.8): libmobi is vulnerable to Out-of-bounds Write
- CVE-2018-11726 — High (CVSS 8.8): The mobi_decode_font_resource function in util.c in Libmobi 0.3 allows remote attackers to cause a denial of service…
- CVE-2018-11724 — High (CVSS 8.8): The mobi_pk1_decrypt function in encryption.c in Libmobi 0.3 allows remote attackers to cause a denial of service…
- CVE-2018-11438 — High (CVSS 8.8): The mobi_decompress_lz77 function in compression.c in Libmobi 0.3 allows remote attackers to cause remote code…
- CVE-2022-1987 — High (CVSS 8.1): Buffer Over-read in GitHub repository bfabiszewski/libmobi prior to 0.11.
- CVE-2022-1908 — High (CVSS 8.1): Buffer Over-read in GitHub repository bfabiszewski/libmobi prior to 0.11.
All CVEs affecting Libmobi Project Libmobi →
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