CVE-2023-29483: eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name

Q: How do I fix CVE-2023-29483?

eventlet: upgrade to 0.35.2; dnspython: upgrade to 2.6.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-29483 being exploited?

CVE-2023-29483 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-29483 affect?

CVE-2023-29483 affects eventlet, dnspython, fedora. Severity is high (CVSS 7.0). 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 word

Q: How urgent is CVE-2023-29483?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.0REMOTEUPGRADEUPGRADEMITIGATE

CVE-2023-29483 is a high-severity flaw (CVSS 7.0) affecting eventlet, dnspython, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fo

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.0 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-292
Published	2024-04-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dnspython · eventlet · fedoraproject · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-11 14:15 UTCPublished CVE record published
2026-06-17 05:50 UTCUpdated Record last modified

eventlet eventlet UPGRADE

Affected: < 0.35.2

Fixed in: 0.35.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy eventlet || rpm -q eventlet || eventlet --version

2. UPGRADE to 0.35.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade eventlet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade eventlet

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

dnspython dnspython UPGRADE

Affected: < 2.6.0

Fixed in: 2.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dnspython || rpm -q dnspython || dnspython --version

2. UPGRADE to 2.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dnspython

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dnspython

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 38 · 39 · 40

Fixed in: no fixed release known

Safe to downgrade to: a release before 38

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp bootstrap os MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-29483?

eventlet: upgrade to 0.35.2; dnspython: upgrade to 2.6.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-29483 being exploited?

CVE-2023-29483 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-29483 affect?

CVE-2023-29483 affects eventlet, dnspython, fedora. Severity is high (CVSS 7.0). 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 word

How urgent is CVE-2023-29483?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Bootstrap vulnerabilities

Related CVEs

CVE-2025-58068 CRITICAL 9.1 UPGRADE Eventlet is a concurrent networking library for Python

References

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