CVE-2021-3733
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…
Does this matter?
Lower severity and a low EPSS score (4.67%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.67% probability · 91th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- python/python · redhat/codeready linux builder · redhat/codeready linux builder for ibm z systems · redhat/codeready linux builder for power little endian · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux for ibm z systems · redhat/enterprise linux for ibm z systems eus · redhat/enterprise linux for power little endian · redhat/enterprise linux for power little endian eus · redhat/enterprise linux server aus · redhat/enterprise linux server for power little endian update services for sap solutions · redhat/enterprise linux server tus · redhat/enterprise linux server update services for sap solutions · fedoraproject/extra packages for enterprise linux · fedoraproject/fedora · netapp/management services for element software and netapp hci · netapp/ontap select deploy administration utility · netapp/solidfire\, enterprise sds \& hci storage node · netapp/hci compute node firmware
- Source
- secalert@redhat.com
References
- https://bugs.python.org/issue43075Exploit, Issue Tracking, Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234Issue Tracking, Third Party Advisory
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fbPatch, Third Party Advisory
- https://github.com/python/cpython/pull/24391Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://security.netapp.com/advisory/ntap-20220407-0001/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3733Patch, Third Party Advisory
- https://bugs.python.org/issue43075Exploit, Issue Tracking, Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234Issue Tracking, Third Party Advisory
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fbPatch, Third Party Advisory
- https://github.com/python/cpython/pull/24391Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://security.netapp.com/advisory/ntap-20220407-0001/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3733Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.