CVE-2021-3537

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

3.59% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 89.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-05-14 19:50Z5 YR AGO

Last updated

2026-10-14 09:49Z15 DAYS AGO

Reserved

2021-05-05

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

fe154cb63a93be4618d5aa0e065d63a9569d01bd1e33e33328fea847c7963826

• 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=1956522x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-b950000d2bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/vendor-advisoryx_refsource_FEDORA
• 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
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• 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