CVE-2017-12132
The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.
Does this matter?
Lower severity and a low EPSS score (1.96%). Track it; it rarely justifies an emergency change on its own.
Description
The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.96% probability · 80th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- gnu/glibc
- Source
- cve@mitre.org
EPSS 2.0% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/100598
- https://access.redhat.com/errata/RHSA-2018:0805
- https://arxiv.org/pdf/1205.4011.pdfTechnical Description, Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=21361Issue Tracking, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/100598
- https://access.redhat.com/errata/RHSA-2018:0805
- https://arxiv.org/pdf/1205.4011.pdfTechnical Description, Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=21361Issue Tracking, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.