No exploitation reportedFix available

CVE-2019-15847

Q: Is CVE-2019-15847 actively exploited?

Active exploitation of CVE-2019-15847 has not been confirmed. Its EPSS score was 3.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-15847?

CVE-2019-15847 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2019-09-02
Fixed in10.1.0 · 9.3.0 · 8.4.0 · 7.5.0
WeaknessCWE-331

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.

Timeline

dates in UTC

2019-09-0223:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-15847?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-15847?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Gnu gcc

Branch	Affected	Fixed in	Source
10.x	≥ 10.0, < 10.1.0	10.1.0	NVD
9.x	≥ 9.0, < 9.3.0	9.3.0	NVD
8.x	≥ 8.0, < 8.4.0	8.4.0	NVD
7.5	< 7.5.0	7.5.0	NVD

Opensuse leap

Branch	Affected	Fixed in	Source
15.0	= 15.0	no fix published	NVD
15.1	= 15.1	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Gnu gcc to 10.1.0 · 9.3.0 · 8.4.0 · 7.5.0

Advisories and patches

gcc.gnu.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-331read 2026-10-23
FIRST EPSSEPSS score3.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2019-09-02
Last Modified: 2026-10-14
NVD status: Modified

Frequently asked questions

What is CVE-2019-15847?

Is CVE-2019-15847 actively exploited?

Active exploitation of CVE-2019-15847 has not been confirmed. Its EPSS score was 3.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-15847?

CVE-2019-15847 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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