CVE-2022-34294Public exploitNetwork attack vector

DNS cache poisoning via fixed UDP source port

Published Aug 15, 2022 · Updated Aug 3, 2024

DNS cache poisoning in totd 1.5.3 allows remote attackers to redirect DNS answers by injecting spoofed upstream resolver replies. The forwarder binds every upstream query to the same UDP source port rather than varying the port, leaving only the DNS transaction ID as meaningful reply entropy. Exploitation requires a script or website loaded by a client behind the forwarder to trigger repeated lookups while spoofed replies impersonate the upstream resolver; successful injection causes clients to accept forged DNS answers.

CVSS severity9.8
Critical
EPSS probability1.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS cache poisoning in totd 1.5.3 allows remote attackers to redirect DNS answers by injecting spoofed upstream resolver replies. The forwarder binds every upstream query to the same UDP source port rather than varying the port, leaving only the DNS transaction ID as meaningful reply entropy. Exploitation requires a script or website loaded by a client behind the forwarder to trigger repeated lookups while spoofed replies impersonate the upstream resolver; successful injection causes clients to accept forged DNS answers.

The record

CVE
CVE-2022-34294
Published
Aug 15, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-331, CAPEC-59, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-331Insufficient Entropy
CAPEC-59Session Credential Falsification through Prediction
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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