CVE-2015-7547

CRITICALNVD 8.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 91% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs). NVD baseline CVSS 8.1 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 91%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 91%CVSS: 8.1Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

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 v3
8.1
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation91% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
91%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 18, 2016

Last Modified

June 17, 2026

References (150)

Vendor Advisories for CVE-2015-7547(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibc6 (2.15-0ubuntu10.13) @ precise2026-05-22ubuntu
redhatrhev-hypervisor7-0:7.2-20160105.2.el7ev2016-02-19redhat
redhatglibc-0:2.12-1.166.el6_7.72016-02-16redhat
redhatglibc-0:2.17-79.ael7b_1.42016-02-16redhat
redhatglibc-0:2.17-106.el7_2.42016-02-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
glibc—
  • every version up to 2.21-8: fixed in 2.21-8
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
glibc—
  • every version up to 2.21-8: fixed in 2.21-8
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
glibc—
  • every version up to 2.21-8: fixed in 2.21-8
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
glibc—
  • every version up to 2.21-8: fixed in 2.21-8
—
Debian:6.0(1)
PackageVulnerable rangeFix by version rangeDependents
eglibc2.11.2-10 ... 2.11.3-4 (10 versions)
  • every version up to 2.11.3-4+deb6u11: fixed in 2.11.3-4+deb6u11
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
eglibc2.13-38 ... 2.13-38+deb7u9 (10 versions)
  • every version up to 2.13-38+deb7u10: fixed in 2.13-38+deb7u10
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.19-18, 2.19-18+deb8u1, 2.19-18+deb8u2
  • every version up to 2.19-18+deb8u3: fixed in 2.19-18+deb8u3
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 2× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-03 14:21 UTCEPSS rescore
  2. 2026-09-30 09:07 UTCEG score recompute
  3. 2026-09-19 03:00 UTCOSV refresh
  4. 2026-09-17 19:21 UTCEPSS rescore
  5. 2026-09-15 03:05 UTCEPSS rescore
  6. 2026-09-10 09:26 UTCEPSS rescore
  7. 2026-09-06 13:42 UTCEPSS rescore
  8. 2026-09-04 13:55 UTCEPSS rescore
  9. 2026-09-01 13:48 UTCEPSS rescore
  10. 2026-08-31 06:25 UTCOSV refresh
  11. 2026-08-19 16:59 UTCEPSS rescore
  12. 2026-08-14 13:54 UTCOSV refresh
  13. 2026-08-11 13:36 UTCEPSS rescore
  14. 2026-08-08 16:32 UTCEPSS rescore
  15. 2026-08-07 16:22 UTCEPSS rescore
  16. 2026-08-01 04:11 UTCEPSS rescore
  17. 2026-07-30 02:24 UTCOSV refresh
  18. 2026-07-30 01:26 UTCEPSS rescore
  19. 2026-07-30 01:26 UTCEPSS rescore
  20. 2026-07-24 14:13 UTCEPSS rescore
  21. 2026-07-23 01:19 UTCEG score recompute
  22. 2026-07-23 00:21 UTCEG score recompute
  23. 2026-07-22 21:59 UTCEG score recompute
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-20 17:03 UTCEPSS rescore
Show 28 more
  1. 2026-07-12 11:37 UTCOSV refresh
  2. 2026-07-08 15:10 UTCEPSS rescore
  3. 2026-07-01 15:02 UTCEPSS rescore
  4. 2026-06-28 04:53 UTCEPSS rescore
  5. 2026-06-27 03:05 UTCEPSS rescore
  6. 2026-06-25 13:47 UTCEPSS rescore
  7. 2026-06-25 13:47 UTCEPSS rescore
  8. 2026-06-23 21:30 UTCEPSS rescore
  9. 2026-06-23 17:00 UTCOSV refresh
  10. 2026-06-16 17:50 UTCEPSS rescore
  11. 2026-06-16 17:50 UTCEPSS rescore
  12. 2026-06-15 17:45 UTCEPSS rescore
  13. 2026-06-06 22:59 UTCOSV refresh
  14. 2026-06-06 13:45 UTCEPSS rescore
  15. 2026-06-05 22:44 UTCEPSS rescore
  16. 2026-06-02 20:10 UTCEPSS rescore
  17. 2026-05-31 00:14 UTCEPSS rescore
  18. 2026-05-28 13:42 UTCEPSS rescore
  19. 2026-05-28 13:42 UTCEPSS rescore
  20. 2026-05-27 13:38 UTCEPSS rescore
  21. 2026-05-27 13:38 UTCEPSS rescore
  22. 2026-05-22 21:21 UTCEG score recompute
  23. 2026-05-22 21:21 UTCVendor advisory
  24. 2026-05-22 21:21 UTCGHSA enrichment
  25. 2026-05-20 22:37 UTCEPSS rescore
  26. 2026-05-20 22:37 UTCEPSS rescore
  27. 2026-05-18 21:30 UTCEPSS rescore
  28. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(6 references)

Working exploit code is in the public domain (4 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-39454✓ verified
    First seen Feb 16, 2016

    glibc - 'getaddrinfo' Stack Buffer Overflow (PoC)

    Open source ↗
  • Exploit-DBEDB-40339
    First seen Sep 6, 2016

    glibc - 'getaddrinfo' Remote Stack Buffer Overflow

    Open source ↗
  • GitHub PoCeSentire/cve-2015-7547-public
    First seen Apr 5, 2016

    PoC attack server for CVE-2015-7547 buffer overflow vulnerability in glibc DNS stub resolver (public version)

    Open source ↗
  • GitHub PoCjgajek/cve-2015-7547
    First seen Mar 10, 2016

    PoC exploit server for CVE-2015-7547

    Open source ↗
  • GitHub PoCcakuzo/CVE-2015-7547
    First seen Feb 17, 2016

    test script for CVE-2015-7547

    Open source ↗
  • GitHub PoCfjserna/CVE-2015-7547
    First seen Feb 10, 2016

    Proof of concept for CVE-2015-7547

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2016:0176

Frequently asked(5)

What is CVE-2015-7547?
CVE-2015-7547 is a critical vulnerability published on February 18, 2016. Multiple stack-based buffer overflows in the (1) senddg and (2) sendvc 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…
When was CVE-2015-7547 disclosed?
CVE-2015-7547 was first published on February 18, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-7547 actively exploited?
CVE-2015-7547 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 91% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2015-7547?
CVE-2015-7547 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
How do I remediate CVE-2015-7547?
A fix for CVE-2015-7547 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2015-7547 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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