CVE-2021-21424

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

5.3 (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:L/I:N/A:N

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

2021-05-13 00:00Z5 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 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
• CWE-203Observable DiscrepancyBase

Data version

5.1

Document digest

8e07bce7042deddc0b1eec6f2bd16fc3807bff2806f83fd5b7dfb4669c67122e

• github.comhttps://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
• github.comhttps://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011
• lists.fedoraproject.orgFEDORA-2021-f3ad34aa9fhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-121edb82ddhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-c57937ab9fhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-2d145b95f6https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/vendor-advisory
• lists.debian.org[debian-lts-announce] 20230711 [SECURITY] [DLA 3493-1] symfony security updatehttps://lists.debian.org/debian-lts-announce/2023/07/msg00014.htmlmailing-list