CVE-2021-20204

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

2.09% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 81.5% 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

2021-05-06 14:50Z5 YR AGO

Last updated

2024-10-17 18:02Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

redhat

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-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-416Use After FreeVariant

Data version

5.1

Document digest

6d456f4ee5bda519a3ed16372cad601b3b20503ec09835bc1d0971147961de84

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1956348x_refsource_MISC
• lists.debian.org[debian-lts-announce] 20210513 [SECURITY] [DLA 2660-1] libgetdata security updatehttps://lists.debian.org/debian-lts-announce/2021/05/msg00015.htmlmailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-e2b64c614bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OE23HBLIVKVPOQ5MVADWPOCFMREVF4QZ/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-3b8bb26909https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/43JTGEMYMCTHD3LHFD7ENBNSWCNBCYEY/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-197545a753https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GB7T7DW7XRPJOUE25ZE7GF244FPCHBWY/vendor-advisoryx_refsource_FEDORA