Is CVE-2021-27135 in the CISA KEV catalog?

No. CVE-2021-27135 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27135?

CVE-2021-27135 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-27135?

CVE-2021-27135 has an EPSS score of 7.54% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27135?

Upgrade xterm on debian 11 to 366-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-27135

CRITICALEPSS 94th pctl

9.8

CVSS v3

NVD

Description

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.

How to fix

Remediation Available

xtermDebian

Fixed in:366-1CVE-2021-27135

xtermUbuntu

Fixed in:322-1ubuntu1.2USN-4746-1

Fixed in:330-1ubuntu2.2USN-4746-1

Fixed in:353-1ubuntu1.20.04.2USN-4746-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

7.54%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

invisible-island.net

Third-Party Advisory8

Issue Tracking2

Other references1

lists.fedoraproject.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.