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HIGH

CVE-2023-29483

CVSS v3

7

HIGH

EPSS Score

1.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dnspythonPyPIall versions · fixed in 2.6.1
  • eventletPyPIall versions · fixed in 0.35.2
  • python3-dnsAlmaLinux:9all versions · fixed in 2.6.1-3.el9
  • python3-dnsAlmaLinux:8all versions · fixed in 1.15.0-12.el8_10

Vendor advisories

  • CVE-2023-29483 Red Hat Product Security20 products fixed · 6 known affected

    dnspython: denial of service in stub resolver

    aap-cloud-metrics-collector-container as a component of Red Hat Ansible Automation Platform 2 · python-dns.src as a component of Red Hat Enterprise Linux 7 · python-dns.src (python27:2.7) as a component of Red Hat Enterprise Linux 8

  • RHSA-2024:9423 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: python-dns security update

  • RHSA-2024:4960 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.14.34 bug fix and security update

  • RHSA-2024:4846 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.46 security update

  • RHSA-2024:4699 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.23 bug fix and security update

  • RHSA-2024:0045 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.16.0 security update

2 more advisories

Full record on NVD

Description

eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Technical details

Published
2024-04-11

Frequently asked questions

What is CVE-2023-29483?

eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Is CVE-2023-29483 actively exploited?

Active exploitation of CVE-2023-29483 has not been confirmed. Its EPSS score was 1.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-29483?

CVE-2023-29483 has a CVSS v3 base score of 7 (HIGH severity).

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