curl before version 7.52.1 is vulnerable to an uninitialized random in libcurl's internal function that returns a good 32bit random value.

Published 8 y ago 2018-04-23 · modified 4 mo ago 2026-06-17 · JSON

CVSS

6.5

v3.0 · CNA

CISA KEV

not known exploited

EPSS

2.2%

percentile 83%

Public exploits

none known

curl before version 7.52.1 is vulnerable to an uninitialized random in libcurl's internal function that returns a good 32bit random value. Having a weak or virtually non-existent random value makes the operations that use it vulnerable.

CISA SSVC assessment

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 6 mo ago 2026-04-15

Exploit prediction (EPSS)

2.22% probability of exploitation in the next 30 days, higher than 83% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CNA	3.0	6.5	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`
CNA	3.0	6.5	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`
NVD	3.0	8.1	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD	2.0	6.8	`AV:N/AC:M/Au:N/C:P/I:P/A:P`

Affected products

unspecified curl

Classification

Weakness

CWE-665 Improper Initialization

References

securityfocus.com /bid/95094 · vdb-entry, x_refsource_BID, x_transferred
curl.haxx.se /docs/adv_20161223.html · x_refsource_CONFIRM, x_transferred
tenable.com /security/tns-2017-04 · x_refsource_CONFIRM, x_transferred
securitytracker.com /id/1037528 · vdb-entry, x_refsource_SECTRACK, x_transferred
security.gentoo.org /glsa/201701-47 · vendor-advisory, x_refsource_GENTOO, x_transferred
bugzilla.redhat.com /show_bug.cgi?id=CVE-2016-9594 · x_refsource_MISC, x_transferred

Sources

CVE List: CVE-2016-9594
NVD: CVE-2016-9594

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary