CVE-2015-7547
Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc or libc6) before 2.23 allow remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted DNS response that triggers a call to the getaddrinfo function with the AF_UNSPEC or AF_INET6 address family, related to performing "dual A/AAAA DNS queries" and the libnss_dns.so.2 NSS module.
- CVSS
- 8.1High
- Exploited in the wild
- Not knownPublic exploit code; not in CISA KEV
- EPSS
- 92.4%chance of exploitation in the next 30 daystop 0.2% of scored CVEsFIRST score of 11 Nov 2026
- Fix
- Patch availablesee the advisories in the references
- Published
- 18 Feb 2016analysed here 12 Nov 2026
Summary
Triage
The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.
Affected products
Products named in our analysis
- debian:debian_linux
- canonical:ubuntu_linux
- hp:helion_openstack
- hp:server_migration_pack
- sophos:unified_threat_management_software
- suse:linux_enterprise_debuginfo
- opensuse:opensuse
- suse:linux_enterprise_desktop
- suse:linux_enterprise_server
- suse:linux_enterprise_software_development_kit
- suse:suse_linux_enterprise_server
- oracle:exalogic_infrastructure
- f5:big-ip_access_policy_manager
- f5:big-ip_advanced_firewall_manager
- f5:big-ip_analytics
- f5:big-ip_application_acceleration_manager
- f5:big-ip_application_security_manager
- f5:big-ip_domain_name_system
- f5:big-ip_link_controller
- f5:big-ip_local_traffic_manager
- f5:big-ip_policy_enforcement_manager
- oracle:fujitsu_m10_firmware
- redhat:enterprise_linux_desktop
- redhat:enterprise_linux_hpc_node
- redhat:enterprise_linux_hpc_node_eus
- redhat:enterprise_linux_server
- redhat:enterprise_linux_server_aus
- redhat:enterprise_linux_server_eus
- redhat:enterprise_linux_workstation
- gnu:glibc
Fix and mitigation
WAF and other mitigations
Can a WAF block it? No. This is a memory-corruption bug. Generic WAF rules do not recognise the input that triggers it; only a rule written for this specific CVE can, and only if the triggering request has a recognisable shape.
Also consider: patch
Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Remediation steps (AI-written)
Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.
Exploitation evidence
- CISA KEV catalog
- Not listed as of our last sync.
- Public exploit code
- Yes: 2 on Exploit-DB · 11 GitHub proofs of concept
Exploit-DB
- glibc - 'getaddrinfo' Remote Stack Buffer Overflowremote, 6 Sept 2016
- glibc - 'getaddrinfo' Stack Buffer Overflow (PoC)dos, 16 Feb 2016, verified by Exploit-DB
GitHub proofs of concept
- fjserna/CVE-2015-7547543 stars
- eSentire/cve-2015-7547-public10 stars
- jgajek/cve-2015-75478 stars
- cakuzo/CVE-2015-75475 stars
and 7 more repositories
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
Timeline
- 10 Feb 2016First public exploit or proof of concept
- 18 Feb 2016Published9 days later
- 6 Aug 2024CVE record last updated3,091 days (about 8 years) later
- 12 Nov 2026Analysed by vulneraibility.com828 days (about 2 years) later
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
| Metric | Value | What it means |
|---|---|---|
| Attack vector | NetworkReachable over the internet or any routable network. | Reachable over the internet or any routable network. |
| Attack complexity | HighNeeds specific conditions, a race or a particular configuration. | Needs specific conditions, a race or a particular configuration. |
| Privileges required | NoneThe attacker needs no prior access. | The attacker needs no prior access. |
| User interaction | NoneNo victim action needed. | No victim action needed. |
| Scope | UnchangedImpact stays within the vulnerable component. | Impact stays within the vulnerable component. |
| Confidentiality | HighTotal data disclosure possible. | Total data disclosure possible. |
| Integrity | HighComplete modification possible. | Complete modification possible. |
| Availability | HighFull outage possible. | Full outage possible. |
Common questions
Is CVE-2015-7547 being exploited?
Not confirmed. CVE-2015-7547 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 92% probability of exploitation in the next 30 days.
How severe is CVE-2015-7547?
CVE-2015-7547 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2015-7547?
Yes. A fix has been recorded for CVE-2015-7547. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2015-7547 affect?
CVE-2015-7547 affects debian:debian_linux, canonical:ubuntu_linux, hp:helion_openstack, hp:server_migration_pack, and 26 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
References
50 references in the CVE record, grouped by the tags the record gives them.
Advisories (17)
- marc.info /?l=bugtraq&m=146161017210491&w=2
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00037.html
- rhn.redhat.com /errata/RHSA-2016-0175.html
- marc.info /?l=bugtraq&m=145857691004892&w=2
- rhn.redhat.com /errata/RHSA-2016-0225.html
- lists.fedoraproject.org /pipermail/package-announce/2016-February/177412.html
Show 11 more
- debian.org /security/2016/dsa-3481
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00042.html
- ubuntu.com /usn/usn-2900-1
- rhn.redhat.com /errata/RHSA-2016-0277.html
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00043.html
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00036.html
- marc.info /?l=bugtraq&m=145672440608228&w=2
- security.gentoo.org /glsa/201602-02
- marc.info /?l=bugtraq&m=145596041017029&w=2
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00038.html
- lists.opensuse.org /opensuse-security-announce/2016-02/msg00039.html
Exploits (1)
- exploit-db.com /exploits/40339/
Other links (32)
- securitytracker.com /id/1035020
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05140858
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05125672
- blogs.sophos.com /2016/02/29/utm-up2date-9-319-released/
- sourceware.org /bugzilla/show_bug.cgi?id=18665
- kb.pulsesecure.net /articles/Pulse_Security_Advisories/SA40161
Show 26 more
- oracle.com /technetwork/security-advisory/cpujan2018-3236628.html
- fortiguard.com /advisory/glibc-getaddrinfo-stack-overflow
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917
- googleonlinesecurity.blogspot.com /2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html
- oracle.com /technetwork/topics/security/linuxbulletinjan2016-2867209.html
- security.netapp.com /advisory/ntap-20160217-0002/
- blogs.sophos.com /2016/02/24/utm-up2date-9-355-released/
- support.lenovo.com /us/en/product_security/len_5450
- tenable.com /security/research/tra-2017-08
- vmware.com /security/advisories/VMSA-2016-0002.html
- securityfocus.com /bid/83265
- fortiguard.com /advisory/glibc-getaddrinfo-stack-overflow
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05158380
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128937
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05098877
- bto.bluecoat.com /security-advisory/sa114
- sourceware.org /ml/libc-alpha/2016-02/msg00416.html
- help.ecostruxureit.com /display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerabilit
- packetstormsecurity.com /files/135802/glibc-getaddrinfo-Stack-Based-Buffer-Overflow.html
- bugzilla.redhat.com /show_bug.cgi?id=1293532
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05008367
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05176716
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05053211
- oracle.com /technetwork/security-advisory/cpuapr2016v3-2985753.html
- h20566.www2.hpe.com /hpsc/doc/public/display?docId=emr_na-c05028479
Where the data on this page comes from
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- FIRST EPSS: exploit probability and percentile
- Exploit-DB: published exploits
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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