CVE-2015-1781

Buffer overflow in the gethostbyname_r and other unspecified NSS functions in the GNU C Library (aka glibc or libc6) before 2.22 allows context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DNS response, which triggers a call with a misaligned buffer.

Published: 2015-09-28 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-1781 is rated Moderate Risk (58.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.01%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-1781

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-26 5.47% 5.01% -0.46%
2 2026-06-15 4.75% 5.47% +0.72%
3 2026-05-13 — 4.75% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-1781

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2015-1781

OS Trackers for CVE-2015-1781

vendor priority summary link
debian not yet assigned CVE-2015-1781 not yet assigned priority: Debian including 1 source packages (glibc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-1781
gentoo high CVE-2015-1781: 1 GLSA(s) (201602-02), 1 atom(s) (sys-libs/glibc); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-1781
redhat medium — https://access.redhat.com/security/cve/CVE-2015-1781
suse medium CVE-2015-1781 severity moderate: SUSE including 558 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 831 product×package rows across 73 product lines (HPE Helion OpenStack 8, SUSE Liberty Linux 7, … (73 product lines)): Fixed 577, Known Affected 157, Known Not Affected 97. https://www.suse.com/security/cve/CVE-2015-1781/
ubuntu low CVE-2015-1781 low priority: Ubuntu including 2 source packages (eglibc, glibc), 20 status rows across 10 suites (lucid, precise, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 9, ignored 3, not-affected 3, released 3, needs-triage 2. https://ubuntu.com/security/CVE-2015-1781

Affected software / configurations for CVE-2015-1781

Vendor Product Version Raw CPE
suse linux_enterprise_debuginfo 11 cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp3:*:*:*:*:*:*
suse linux_enterprise_debuginfo 11 cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp4:*:*:*:*:*:*
suse linux_enterprise_desktop 11 cpe:2.3:o:suse:linux_enterprise_desktop:11:sp3:*:*:*:*:*:*
suse linux_enterprise_desktop 11 cpe:2.3:o:suse:linux_enterprise_desktop:11:sp4:*:*:*:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:*:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp3:*:*:*:vmware:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp4:*:*:*:*:*:*
gnu glibc <= 2.21 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 15.04 cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

References for CVE-2015-1781

URL Tags
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177404.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00019.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00036.html Mailing List Third Party Advisory
http://www.debian.org/security/2016/dsa-3480 Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html Third Party Advisory
http://www.securityfocus.com/bid/74255 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1032178 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-2985-1 Third Party Advisory
http://www.ubuntu.com/usn/USN-2985-2 Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2015-0863.html Third Party Advisory
https://security.gentoo.org/glsa/201602-02 Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=18287 Issue Tracking Third Party Advisory
https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=2959eda9272a03386
https://www.sourceware.org/ml/libc-alpha/2015-08/msg00609.html Mailing List Third Party Advisory
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