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CVE details

CVE-2021-3733

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

Score
6.5 medium
Published
2022-03-10
Links
NVD · cve.org

Affected ports (1)

PortPackageVersionStatusMaintainer
lang/python27python272.7.18_5unaddressedpython@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>python27</name>
	<range><lt>3.6.14</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker
	who controls a malicious HTTP server that an HTTP client (such as web
	browser) connects to, could trigger a Regular Expression Denial of
	Service (ReDOS) during an authentication request with a specially
	crafted payload that is sent by the server to the client. The greatest
	threat that this flaw poses is to application availability.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2021-3733</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2021-3733</url>
    </references>
    <dates>
      <discovery>2022-03-10</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>