Is CVE-2021-3700 in the CISA KEV catalog?

No. CVE-2021-3700 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3700?

CVE-2021-3700 has a CVSS v3 base score of 6.4 (MEDIUM).

What is the EPSS score for CVE-2021-3700?

CVE-2021-3700 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3700?

Upgrade usbredir on debian 12 to 0.11.0-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3700

MEDIUM

6.4

CVSS v3

NVD

Description

A use-after-free vulnerability was found in usbredir in versions prior to 0.11.0 in the usbredirparser_serialize() in usbredirparser/usbredirparser.c. This issue occurs when serializing large amounts of buffered write data in the case of a slow or blocked destination.

CWE-416Use After Free

How to fix

Remediation Available

usbredirDebian

Fixed in:0.11.0-1CVE-2021-3700

libusbredirhost1Ubuntu

Fixed in:0.6-2ubuntu1.1+esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.16.04.1~esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.18.04.1USN-5784-1

Fixed in:0.8.0-1ubuntu0.1USN-5784-1

libusbredirparser1Ubuntu

Fixed in:0.6-2ubuntu1.1+esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.16.04.1~esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.18.04.1USN-5784-1

Fixed in:0.8.0-1ubuntu0.1USN-5784-1

usbredirUbuntu

Fixed in:0.6-2ubuntu1.1+esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.16.04.1~esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.18.04.1USN-5784-1

Fixed in:0.8.0-1ubuntu0.1USN-5784-1

usbredirserverUbuntu

Fixed in:0.6-2ubuntu1.1+esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.16.04.1~esm1USN-5784-1

Fixed in:0.7.1-1ubuntu0.18.04.1USN-5784-1

Fixed in:0.8.0-1ubuntu0.1USN-5784-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Patch2

Third-Party Advisory1

lists.debian.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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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.