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Vulnerability record · CVE-2022-30295 · published 6 May 2022

CVE-2022-30295: Uclibc vulnerability

Uclibc · Uclibc

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.

6.5 CVSS 3.1 Medium EPSS 12% · top 4.0% CWE-330 · CWE-330
6.5CVSS 3.1 base score, v2 4.0
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.kb.cert.org/vuls/id/473698 Third Party AdvisoryUS Government Resource
https://www.nozominetworks.com/blog/nozomi-networks-discovers-unpatched-dns-bug-in-popular-c-standard-library-putting-io Third Party Advisory
https://www.kb.cert.org/vuls/id/473698 Third Party AdvisoryUS Government Resource
https://www.nozominetworks.com/blog/nozomi-networks-discovers-unpatched-dns-bug-in-popular-c-standard-library-putting-io Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-29503Uclibc memory buffer overflow vulnerabilityA memory corruption vulnerability exists in the libpthread linuxthreads functionality of uClibC 0.9.33.2 and uClibC-ng 1.0.40. Thread allocation can …EPSS 1.3%9.8CVE-2021-27419Uclibc-ng project uclibc-ng integer overflow vulnerabilityuClibc-ng versions prior to 1.0.37 are vulnerable to integer wrap-around in functions malloc-simple. This improper memory assignment can lead to arbi…EPSS 1.7%9.8CVE-2017-9728Uclibc out-of-bounds read vulnerabilityIn uClibc 0.9.33.2, there is an out-of-bounds read in the get_subexp function in misc/regex/regexec.c when processing a crafted regular expression.EPSS 1.2%9.6CVE-2021-43523Uclibc cross-site scripting vulnerabilityIn uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinf…EPSS 3.1%7.5CVE-2017-9729Uclibc vulnerabilityIn uClibc 0.9.33.2, there is stack exhaustion (uncontrolled recursion) in the check_dst_limits_calc_pos_1 function in misc/regex/regexec.c when proce…EPSS 1.1%7.5CVE-2016-2224Uclibc-ng project uclibc-ng uncontrolled resource consumption vulnerabilityThe __decode_dotted function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows remote DNS servers to cause a denial of service (infinite loop) …EPSS 2.8%7.5CVE-2016-2225Uclibc-ng project uclibc-ng uncontrolled resource consumption vulnerabilityThe __read_etc_hosts_r function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows remote DNS servers to cause a denial of service (infinite loo…EPSS 2.5%7.5CVE-2016-6264Uclibc vulnerabilityInteger signedness error in libc/string/arm/memset.S in uClibc and uClibc-ng before 1.0.16 allows context-dependent attackers to cause a denial of se…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2022-30295), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.