The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before…
Priority LOW 32CWE-17Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Partial · None
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.
Why it matters now
EPSS 0.05808 93rd percentileScored 2026-11-07
Fix Fixed Red Hat: 4 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:*:*:*:*:*:*:* | 6.5 | Vulnerable | Red Hat |
| cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:* | 10.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:* | 14.10 | Vulnerable | Canonical |
| cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:* | 13.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* | 13.2 | Vulnerable | openSUSE |
| cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* | before 2.20 | Vulnerable | GNU |
- cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:*:*:*:*:*:*:* Versions 6.5 Vulnerable ·Red Hat
- cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:* Versions 10.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:* Versions 14.10 Vulnerable ·Canonical
- cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:* Versions 13.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* Versions 13.2 Vulnerable ·openSUSE
- cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* Versions before 2.20 Vulnerable ·GNU
Remediation
Red Hat 4 advisories
- RHSA-2016:1207 Released 2016-06-07 · Red Hat rating Moderateglibc security update
- Red Hat Enterprise Linux Server AUS (v. 6.5) glibc-2.12-1.132.el6_5.8, glibc-common-2.12-1.132.el6_5.8, glibc-devel-2.12-1.132.el6_5.8 +3
- Red Hat Enterprise Linux Server Optional AUS (v. 6.5) glibc-2.12-1.132.el6_5.8, glibc-static-2.12-1.132.el6_5.8
- RHSA-2015:2589 Released 2015-12-09 · Red Hat rating Importantglibc security update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) glibc-2.17-79.el7_1, glibc-common-2.17-79.el7_1, glibc-devel-2.17-79.el7_1 +3
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) glibc-static-2.17-79.el7_1
- Red Hat Enterprise Linux Server EUS (v. 7.1) glibc-2.17-79.ael7b_1, glibc-2.17-79.el7_1, glibc-2.17-79.el7_1.ppc +11
- Red Hat Enterprise Linux Server Optional EUS (v. 7.1) glibc-static-2.17-79.ael7b_1, glibc-static-2.17-79.el7_1, glibc-static-2.17-79.el7_1.ppc
- RHSA-2015:2199 Released 2015-11-19 · Red Hat rating Moderateglibc security, bug fix, and enhancement update
- Red Hat Enterprise Linux Client (v. 7) glibc-2.17-105.el7, glibc-common-2.17-105.el7, glibc-devel-2.17-105.el7 +3
- Red Hat Enterprise Linux Client Optional (v. 7) glibc-static-2.17-105.el7
- Red Hat Enterprise Linux ComputeNode (v. 7) glibc-2.17-105.el7, glibc-common-2.17-105.el7, glibc-devel-2.17-105.el7 +3
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) glibc-static-2.17-105.el7
- Red Hat Enterprise Linux Server (v. 7) glibc-2.17-105.el7, glibc-2.17-105.el7.ppc, glibc-common-2.17-105.el7 +5
- Red Hat Enterprise Linux Server Optional (v. 7) glibc-static-2.17-105.el7, glibc-static-2.17-105.el7.ppc
- Red Hat Enterprise Linux Workstation (v. 7) glibc-2.17-105.el7, glibc-common-2.17-105.el7, glibc-devel-2.17-105.el7 +3
- Red Hat Enterprise Linux Workstation Optional (v. 7) glibc-static-2.17-105.el7
Show 1 more Red Hat advisories
- RHSA-2015:0863 Released 2015-04-21 · Red Hat rating Moderateglibc security and bug fix update
- Red Hat Enterprise Linux Desktop (v. 6) glibc-2.12-1.149.el6_6.7, glibc-common-2.12-1.149.el6_6.7, glibc-devel-2.12-1.149.el6_6.7 +3
- Red Hat Enterprise Linux Desktop Optional (v. 6) glibc-static-2.12-1.149.el6_6.7
- Red Hat Enterprise Linux HPC Node (v. 6) glibc-2.12-1.149.el6_6.7, glibc-common-2.12-1.149.el6_6.7, glibc-devel-2.12-1.149.el6_6.7 +3
- Red Hat Enterprise Linux HPC Node Optional (v. 6) glibc-static-2.12-1.149.el6_6.7
- Red Hat Enterprise Linux Server (v. 6) glibc-2.12-1.149.el6_6.7, glibc-2.12-1.149.el6_6.7.ppc, glibc-common-2.12-1.149.el6_6.7 +5
- Red Hat Enterprise Linux Server Optional (v. 6) glibc-static-2.12-1.149.el6_6.7, glibc-static-2.12-1.149.el6_6.7.ppc
- Red Hat Enterprise Linux Workstation (v. 6) glibc-2.12-1.149.el6_6.7, glibc-common-2.12-1.149.el6_6.7, glibc-devel-2.12-1.149.el6_6.7 +3
- Red Hat Enterprise Linux Workstation Optional (v. 6) glibc-static-2.12-1.149.el6_6.7
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) | Fixed | RHSA-2015:2589 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) | Fixed | RHSA-2015:2589 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux Server AUS (v. 6.5) | Fixed | RHSA-2016:1207 |
| Red Hat Enterprise Linux Server EUS (v. 7.1) | Fixed | RHSA-2015:2589 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux Server Optional AUS (v. 6.5) | Fixed | RHSA-2016:1207 |
| Red Hat Enterprise Linux Server Optional EUS (v. 7.1) | Fixed | RHSA-2015:2589 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2015:2199 |
Not affected: 1 product
- Red Hat Enterprise Linux 5
Timeline
- 2026-10-02 Threatist record created from CVE-2013-7423
- 2026-10-03 Alias added: GHSA-7q6m-8g97-jq6m
References
Advisory 7
Sources
- CVE-2013-7423 · CVE Program
- CVE-2013-7423 · NVD
- FIRST EPSS
- GHSA-7q6m-8g97-jq6m · GitHub Advisory Database · CC BY 4.0
- CVE-2013-7423 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences