// For flags

CVE-2021-3700

Ubuntu Security Notice USN-5784-1

Severity Score

6.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Se ha encontrado una vulnerabilidad de uso de memoria previamente liberada en usbredir en versiones anteriores a 0.11.0, en la función usbredirparser_serialize() en el archivo usbredirparser/usbredirparser.c. Este problema es producido cuando son serializados grandes cantidades de datos de escritura en búfer en el caso de un destino lento o bloqueado

It was discovered that usbredir incorrectly handled memory when serializing large amounts of data in the case of a slow or blocked destination. An attacker could possibly use this issue to cause applications using usbredir to crash, resulting in a denial of service, or possibly execute arbitrary code.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-08-11 CVE Reserved
  • 2022-02-24 CVE Published
  • 2024-08-03 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-416: Use After Free
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Spice-space
Search vendor "Spice-space"
Usbredir
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< 0.11.0
Search vendor "Spice-space" for product "Usbredir" and version " < 0.11.0"
-
Affected
Redhat
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Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
6.0
Search vendor "Redhat" for product "Enterprise Linux" and version "6.0"
-
Affected
Redhat
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Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
7.0
Search vendor "Redhat" for product "Enterprise Linux" and version "7.0"
-
Affected
Redhat
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Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
8.0
Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"
-
Affected
Fedoraproject
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Fedora
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34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected
Debian
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Debian Linux
Search vendor "Debian" for product "Debian Linux"
9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected