CVE-2018-16840

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

3.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 88.2% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2018-10-31 18:00Z7 YR AGO

Last updated

2026-04-16 14:08Z6 MO AGO

Reserved

2018-09-11

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Medium (CVSS 4.3)

CNA CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

8b8a5d157cd79e3ebbc8994451c2493b5bec4ceadc868009e7c2834e352d3e95

• security.gentoo.orgGLSA-201903-03https://security.gentoo.org/glsa/201903-03vendor-advisoryx_refsource_GENTOO
• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840x_refsource_CONFIRM
• github.comhttps://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fx_refsource_CONFIRM
• www.securitytracker.com1042013http://www.securitytracker.com/id/1042013vdb-entryx_refsource_SECTRACK
• curl.haxx.sehttps://curl.haxx.se/docs/CVE-2018-16840.htmlx_refsource_MISC
• usn.ubuntu.comUSN-3805-1https://usn.ubuntu.com/3805-1/vendor-advisoryx_refsource_UBUNTU