CVE-2023-29483: eventlet · n/a
Affects eventletSource CVE Database V5
Not known to be exploited · CVSS 7.0 High : upgrade to 0.35.2 soon.
Data as of 25 Oct 2026, 19:02 UTC
- EPSS
- 1.8% chance of exploitation in 30 days – higher than 79% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.35.2, 2.6.0
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:HExploitation evidence
Disclosed: evidence found.
CVE published 11 Apr 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.
What to do
Upgrade eventlet to 0.35.2; dnspython to 2.6.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
PyPIeventletpkg:pypi/eventletOther threats | Affected
| Fixed in
|
PyPIdnspythonpkg:pypi/dnspythonOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
The primary mitigation is to upgrade dnspython to version 2.6.1 or later, which resolves the vulnerability and related issues. Additionally, ensure that eventlet is updated to version 0.35.2 or newer to eliminate the underlying cause. Organizations should audit their software dependencies to identify and remediate vulnerable dnspython versions. Implement network-level protections such as DNS query rate limiting and anomaly detection to identify and block rapid invalid DNS packets indicative of a TuDoor attack. Employ DNS security extensions (DNSSEC) where applicable to enhance DNS integrity. Monitoring DNS resolution logs for unusual patterns can help detect exploitation attempts. For critical infrastructure, consider fallback DNS resolvers or redundant DNS services to maintain availability during attacks. Finally, maintain an up-to-date inventory of Python libraries in use and integrate automated dependency scanning into the software development lifecycle.
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.
References
- dnspython.org (opens in a new tab)
- github.com/rthalley/dnspython/releases/tag/v2.6.0 (opens in a new tab)
- github.com/rthalley/dnspython/issues/1045 (opens in a new tab)
- security.snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713 (opens in a new tab)
- github.com/eventlet/eventlet/issues/913 (opens in a new tab)
- github.com/eventlet/eventlet/releases/tag/v0.35.2 (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH/ (opens in a new tab)
- security.netapp.com/advisory/ntap-20240510-0001/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3BNSIK5NFYSAP53Y45GOCMOQHHDLGIF/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH/ (opens in a new tab)