CVE-2022-30295Network attack vector

DNS cache poisoning via predictable transaction IDs

Published May 6, 2022 · Updated Aug 3, 2024

DNS cache poisoning in uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 allows remote attackers to redirect DNS clients. The dns_lookup function creates requests without adequately randomizing the DNS transaction ID, making successive identifiers predictable. Exploitation requires predicting the identifier and source port and winning a race against the legitimate DNS response; success inserts a forged DNS answer that redirects subsequent traffic.

CVSS severity6.5
Medium
EPSS probability12.18%
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 uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 allows remote attackers to redirect DNS clients. The dns_lookup function creates requests without adequately randomizing the DNS transaction ID, making successive identifiers predictable. Exploitation requires predicting the identifier and source port and winning a race against the legitimate DNS response; success inserts a forged DNS answer that redirects subsequent traffic.

The record

CVE
CVE-2022-30295
Published
May 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330, CAPEC-112, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 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

6.5NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0NIST NVDAV:N/AC:H/Au:N/C:P/I:P/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
CAPEC-112Brute Force
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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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