CVE-2015-7547: Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GN…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 17 Aug 2021. It cites 1 public report, the first from 17 Aug 2021.

• dl.acm.org

How likely is exploitation in the next 30 days?

92.4%

Up from 91% on 22 Oct 2026.

EPSS score, percentile 99.8 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (12)

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

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.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• HPSBGN03582 (Vendor advisory)
• SUSE-SU-2016:0471 (Vendor advisory)
• RHSA-2016:0175 (Vendor advisory)
• HPSBGN03551 (Vendor advisory)
• RHSA-2016:0225 (Vendor advisory)
• FEDORA-2016-0f9e9a34ce (Vendor advisory)
• DSA-3481 (Vendor advisory)
• openSUSE-SU-2016:0510 (Vendor advisory)
• USN-2900-1 (Vendor advisory)
• RHSA-2016:0277 (Vendor advisory)
• openSUSE-SU-2016:0511 (Vendor advisory)
• SUSE-SU-2016:0470 (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline