Is CVE-2021-28693 in the CISA KEV catalog?

No. CVE-2021-28693 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28693?

CVE-2021-28693 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-28693?

CVE-2021-28693 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28693?

Upgrade xen on debian 11 to 4.14.2+25-gb6a8c4f72d-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-28693

MEDIUM

5.5

CVSS v3

NVD

Description

xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.

How to fix

Remediation Available

xenDebian

Fixed in:4.14.2+25-gb6a8c4f72d-1CVE-2021-28693

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Vendor Advisory1

xenbits.xenproject.org

Third-Party Advisory1

security.gentoo.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.