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CVE-2022-30295

28
FAUCET Score

CVE-2022-30295 describes a DNS cache poisoning vulnerability affecting uClibc-ng versions up to 1.0.40 and uClibc up to 0.9.33.2, stemming from the use of predictable DNS transaction IDs. This flaw carries a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with high attack complexity to achieve high confidentiality impact and low integrity impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.33.2CPE matchmatch criteria
cpe:2.3:a:uclibc:uclibc:*:*:*:*:*:*:*:*
<= 1.0.40CPE matchmatch criteria
cpe:2.3:a:uclibc-ng_project:uclibc-ng:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
11.90%
Probability of exploitation in next 30 days
EPSS Percentile
95.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1190 is in the 96th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: 18709-16820Fixed in: 1.0.41-1
microsoftpatch availablevia msrc
Product: 18710-16823Fixed in: 1.0.41-1
microsoftpatch availablevia msrc
Product: cm1 uclibc-ng 1.0.41-1 on CBL Mariner 1.0Fixed in: 1.0.41-1
microsoftpatch availablevia msrc
Product: cbl2 uclibc-ng 1.0.41-1 on CBL Mariner 2.0Fixed in: 1.0.41-1

Vendor Advisories (1)

microsoft2022-May/CVE-2022-30295Moderate

uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 use predictable DNS transaction IDs that may lead to DNS cache poisoning. This is related to a reset of a value to 0x2.

May 10, 2022

References

kb.cert.org / vuls/id/473698
Third Party AdvisoryUS Government Resource
nozominetworks.com / blog/nozomi-networks-discovers-unpatched-dns-bug-in-popular-c-standard-library-putting-iot-at-risk
Third Party Advisory