CVE-2021-33910

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

8.79% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 94.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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

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

2021-07-20 18:13Z5 YR AGO

Last updated

2026-10-14 11:44Z15 DAYS AGO

Reserved

2021-06-07

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

b6ccd889e3b9ae226435f9538f9e98926ee3d399f4f3149af06bc53f98fd3ec6

• github.comhttps://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9x_refsource_MISC
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/07/20/2x_refsource_MISC
• security.gentoo.orgGLSA-202107-48https://security.gentoo.org/glsa/202107-48vendor-advisoryx_refsource_GENTOO
• www.debian.orgDSA-4942https://www.debian.org/security/2021/dsa-4942vendor-advisoryx_refsource_DEBIAN
• packetstormsecurity.comhttp://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlx_refsource_MISC
• github.comhttps://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896bx_refsource_MISC
• github.comhttps://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61x_refsource_MISC
• github.comhttps://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538x_refsource_MISC
• github.comhttps://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733bx_refsource_MISC
• github.comhttps://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136cex_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-2a6ba64260https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-166e461c8dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/vendor-advisoryx_refsource_FEDORA
• www.openwall.com[oss-security] 20210804 Re: Pop!_OS Membership to linux-distros listhttp://www.openwall.com/lists/oss-security/2021/08/04/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210817 Re: Pop!_OS Membership to linux-distros listhttp://www.openwall.com/lists/oss-security/2021/08/17/3mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210907 Re: Pop!_OS Membership to linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/07/3mailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20211104-0008/x_refsource_CONFIRM
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdfx_refsource_CONFIRM
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-222547.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html