7.8

CVE-2021-20319: redhat coreos-installer

Modified
AliasesRHSA-2021:3926RHSA-2021:3930RHSA-2021:3934
Published 04-03-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-20319 is a high (CVSS 7.8) vulnerability in redhat coreos-installer. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 44.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.52%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2022:0055

Timeline

  1. 04-03-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation image can bypass the image signature verification and as a consequence can lead to the installation of unsigned content. An attacker able to modify the original installation image can write arbitrary data, and achieve full access to the node being installed.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.52% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat6 products
  • coreos-installer< 0.10.1
  • coreos-installer< 0:0.9.0-7.rhaos4.8.el8 | < 0:0.8.0-4.rhaos4.7.el8 | < 0:0.10.1-1.rhaos4.9.el8 | < 0:0.6.0-4.rhaos4.6.el8
  • coreos-installer-bootinfra< 0:0.9.0-7.rhaos4.8.el8 | < 0:0.8.0-4.rhaos4.7.el8 | < 0:0.10.1-1.rhaos4.9.el8 | < 0:0.6.0-4.rhaos4.6.el8
  • coreos-installer-bootinfra-debuginfo< 0:0.9.0-7.rhaos4.8.el8 | < 0:0.8.0-4.rhaos4.7.el8 | < 0:0.10.1-1.rhaos4.9.el8 | < 0:0.6.0-4.rhaos4.6.el8
  • coreos-installer-debuginfo< 0:0.9.0-7.rhaos4.8.el8 | < 0:0.8.0-4.rhaos4.7.el8 | < 0:0.10.1-1.rhaos4.9.el8 | < 0:0.6.0-4.rhaos4.6.el8
Crates.Io1 product
  • coreos-installer< 0.10.1 | ≥ 0.0.0-0, < 0.10.1

2 vendors · 7 products

References

22 links
Show all 22 references