CVE-2021-3756

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.06% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 64.4% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-29 15:55Z5 YR AGO

Last updated

2024-08-03 17:09Z2 YR AGO

Reserved

2021-08-31

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

Medium (CVSS 6.2)

CNA CVSS vector

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

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

312850b613595cb3753f6c23c60fafca3f8ff81f2dca713ab6a922bd861a46a4

• huntr.devhttps://huntr.dev/bounties/7ca8d9ea-e2a6-4294-af28-70260bb53bc1x_refsource_CONFIRM
• github.comhttps://github.com/hoene/libmysofa/commit/890400ebd092c574707d0c132124f8ff047e20e1x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-36ac17e5achttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WGY7TAZX2M4NYXXGNHIBBKKN5XMSMKQ4/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-28b495e9e0https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PGQ45S4RH7MC42NHTAGOIHYR4C5IRTMZ/vendor-advisoryx_refsource_FEDORA