CVE-2021-3518

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

21.85% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 97.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Moderate. 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

2021-05-18 11:20Z5 YR AGO

Last updated

2026-10-14 09:49Z15 DAYS AGO

Reserved

2021-04-27

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

7d089d0902371443dce55ec36cf9d43175f518b4e49e2979ceaff331d13a1ab6

• lists.fedoraproject.orgFEDORA-2021-e3ed1ba38bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20210510 [SECURITY] [DLA 2653-1] libxml2 security updatehttps://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlmailing-listx_refsource_MLIST
• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1954242x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-b950000d2bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/vendor-advisoryx_refsource_FEDORA
• lists.apache.org[bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3Emailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202107-05https://security.gentoo.org/glsa/202107-05vendor-advisoryx_refsource_GENTOO
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210625-0002/x_refsource_CONFIRM
• seclists.org20210723 APPLE-SA-2021-07-21-5 watchOS 7.6http://seclists.org/fulldisclosure/2021/Jul/58mailing-listx_refsource_FULLDISC
• seclists.org20210723 APPLE-SA-2021-07-21-1 iOS 14.7 and iPadOS 14.7http://seclists.org/fulldisclosure/2021/Jul/54mailing-listx_refsource_FULLDISC
• seclists.org20210723 APPLE-SA-2021-07-21-2 macOS Big Sur 11.5http://seclists.org/fulldisclosure/2021/Jul/55mailing-listx_refsource_FULLDISC
• seclists.org20210723 APPLE-SA-2021-07-21-6 tvOS 14.7http://seclists.org/fulldisclosure/2021/Jul/59mailing-listx_refsource_FULLDISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• support.apple.comhttps://support.apple.com/kb/HT212605x_refsource_CONFIRM
• support.apple.comhttps://support.apple.com/kb/HT212602x_refsource_CONFIRM
• support.apple.comhttps://support.apple.com/kb/HT212601x_refsource_CONFIRM
• support.apple.comhttps://support.apple.com/kb/HT212604x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.htmlx_refsource_MISC
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html