glibc: getaddrinfo() writes DNS queries to random file descriptors under high load
Published Feb 24, 2015
5.0
MEDIUMCVSS 2.0
EPSS 5.81%
Description
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.
Affected products
No data.
Configuration 1
- 6.5
Configuration 2
- 10.04
- 12.04
- 14.04
- 14.10
- 13.1
- 13.2
No data.
Red Hat Enterprise Linux 6
glibc-0:2.12-1.149.el6_6.7
Fixed · RHSA-2015:0863
Red Hat Enterprise Linux 6.5 Advanced Update Support
glibc-0:2.12-1.132.el6_5.8
Fixed · RHSA-2016:1207
Red Hat Enterprise Linux 7
glibc-0:2.17-105.el7
Fixed · RHSA-2015:2199
Red Hat Enterprise Linux 7.1 Extended Update Support
glibc-0:2.17-79.ael7b_1
Fixed · RHSA-2015:2589
Red Hat Enterprise Linux 5
glibc
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | glibc-0:2.12-1.149.el6_6.7 | Fixed | RHSA-2015:0863 |
| Red Hat Enterprise Linux 6.5 Advanced Update Support | glibc-0:2.12-1.132.el6_5.8 | Fixed | RHSA-2016:1207 |
| Red Hat Enterprise Linux 7 | glibc-0:2.17-105.el7 | Fixed | RHSA-2015:2199 |
| Red Hat Enterprise Linux 7.1 Extended Update Support | glibc-0:2.17-79.ael7b_1 | Fixed | RHSA-2015:2589 |
| Red Hat Enterprise Linux 5 | glibc | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of glibc as shipped with Red Hat Enterprise Linux 5 as they did not include the vulnerable code, which was introduced in later versions.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 5.81% (0.05808) | 92.91th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.81% (0.05808) | 92.14th | v5 (v2026.06.15) |
| May 13, 2026 | 3.15% (0.03151) | 87.03th | v4 (v2025.03.14) |
| Dec 28, 2025 | 4.67% (0.04669) | 88.97th | v4 (v2025.03.14) |
| Dec 27, 2025 | 3.15% (0.03151) | 86.53th | v4 (v2025.03.14) |
| Oct 28, 2025 | 4.67% (0.04669) | 88.81th | v4 (v2025.03.14) |
| Oct 27, 2025 | 3.15% (0.03151) | 86.39th | v4 (v2025.03.14) |
| Oct 1, 2025 | 4.67% (0.04669) | 88.90th | v4 (v2025.03.14) |
| Jun 6, 2025 | 3.35% (0.03347) | 86.70th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.71% (0.00706) | 70.48th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.35% (0.00353) | 72.80th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.35% (0.00347) | 70.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.35% (0.00347) | 67.16th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (15)
- http://lists.opensuse.org/opensuse-updates/2015-02/msg00089.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://packetstormsecurity.com/files/164014/Moxa-Command-Injection-Cross-Site-Scripting-Vulnerable-Software.html x_refsource_MISC
- http://rhn.redhat.com/errata/RHSA-2015-0863.html vendor-advisoryx_refsource_REDHAT
- http://seclists.org/fulldisclosure/2021/Sep/0 mailing-listx_refsource_FULLDISC
- http://www.openwall.com/lists/oss-security/2015/01/28/20 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/72844 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2519-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/errata/RHSA-2016:1207 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2013-7423 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1187109 Issue Tracking
- https://github.com/golang/go/issues/6336 x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2013-7423
- https://security.gentoo.org/glsa/201602-02 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=15946 x_refsource_CONFIRMIssue Tracking
- https://www.cve.org/CVERecord?id=CVE-2013-7423
Change history (0)
No recorded changes yet.