CVE-2020-15999

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2021-11-17.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active 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

63.89% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Important. 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

2020-11-03 00:00Z5 YR AGO

Last updated

2025-10-21 23:35Z1 YR AGO

Reserved

2020-07-27

Assigning CNA

Chrome

Record state

PUBLISHED

Severity

Critical (CVSS 9.6)

CNA CVSS vector

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

Weaknesses

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')Base
• CWE-787Out-of-bounds WriteBase
• CWE-190Integer Overflow or WraparoundBase

Data version

5.1

Document digest

31c9b7fa685ce3267604c09f596603074e04f7b53b39abf1afc2171985e01d94

• crbug.comhttps://crbug.com/1139963
• chromereleases.googleblog.comhttps://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html
• lists.opensuse.orgopenSUSE-SU-2020:1829http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.htmlvendor-advisory
• lists.fedoraproject.orgFEDORA-2020-6b35849eddhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7/vendor-advisory
• security.gentoo.orgGLSA-202011-12https://security.gentoo.org/glsa/202011-12vendor-advisory
• seclists.org20201118 TCMalloc viewer/dumper - TCMalloc Inspector Toolhttp://seclists.org/fulldisclosure/2020/Nov/33mailing-list
• security.gentoo.orgGLSA-202012-04https://security.gentoo.org/glsa/202012-04vendor-advisory
• www.debian.orgDSA-4824https://www.debian.org/security/2021/dsa-4824vendor-advisory
• googleprojectzero.blogspot.comhttps://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html
• security.gentoo.orgGLSA-202401-19https://security.gentoo.org/glsa/202401-19vendor-advisory
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20240812-0001/
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15999government-resource