CVE-2020-12403

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

1.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 74.4% of scored records. A rank, not a probability.

NVD base score

9.1 (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:N/A:H

NVD analysis status

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

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2021-05-27 00:00Z5 YR AGO

Last updated

2024-08-04 11:56Z2 YR AGO

Reserved

2020-04-28

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.1

Document digest

fcc66a1f3a1c169fb3ad91f71c306f7b89d7a2ebbff184c091bb4f040e1e0f35

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1868931
• developer.mozilla.orghttps://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes
• lists.debian.org[debian-lts-announce] 20230220 [SECURITY] [DLA 3327-1] nss security updatehttps://lists.debian.org/debian-lts-announce/2023/02/msg00021.htmlmailing-list
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230324-0006/