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01 Record

CVE-2021-21368

Prototype poisoning

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.7 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:H
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02 Description

Prototype poisoning

03 Exploitation and scoring

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
1.64% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 76.0% of scored records. A rank, not a probability.
NVD base score
8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/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.

04 Metadata

Published
2021-03-12 17:00Z5 YR AGO
Last updated
2024-08-03 18:09Z2 YR AGO
Reserved
2020-12-22
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.7)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:H
Weaknesses
  • CWE-915Improperly Controlled Modification of Dynamically-Determined Object AttributesBase
  • CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')Variant
Data version
5.1
Document digest
e843c46cb45501e4102259c9352c69e851b0fc116da7717c5cde2b7b380658b0

05 Affected products

VendorProductVersionsPlatforms
mcollinamsgpack5< 3.6.1, >= 4.0.0, < 4.5.1, >= 5.0.0, < 5.2.1—

06 References