CVE-2021-36088

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 82.4% 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

2021-07-01 02:50Z5 YR AGO

Last updated

2024-08-04 00:47Z2 YR AGO

Reserved

2021-07-01

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

• CWE-415Double FreeVariant

Data version

5.1

Document digest

ab5e25841650c1c8fb95118bcacb001a88c85c854095b3763066099e16b1ccca

• bugs.chromium.orghttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750
• github.comhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml
• github.comhttps://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54
• github.comhttps://github.com/fluent/fluent-bit/pull/3453