CVE-2021-45960

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total 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

4.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 90.1% 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:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

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

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

2022-01-01 18:47Z4 YR AGO

Last updated

2025-05-05 16:45Z1 YR AGO

Reserved

2022-01-01

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

• CWE-682Incorrect CalculationPillar
• CWE-1335Incorrect Bitwise Shift of IntegerBase

Data version

5.1

Document digest

ce885144c641abd66a72a18f1ce8dd10e974e3c7796c80e5e3e483f590bb11fb

• github.comhttps://github.com/libexpat/libexpat/issues/531x_refsource_MISC
• github.comhttps://github.com/libexpat/libexpat/pull/534x_refsource_MISC
• bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1217609x_refsource_MISC
• www.openwall.com[oss-security] 20220117 Expat 2.4.3 released, includes 8 security fixeshttp://www.openwall.com/lists/oss-security/2022/01/17/3mailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20220121-0004/x_refsource_CONFIRM
• www.tenable.comhttps://www.tenable.com/security/tns-2022-05x_refsource_CONFIRM
• www.debian.orgDSA-5073https://www.debian.org/security/2022/dsa-5073vendor-advisoryx_refsource_DEBIAN
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfx_refsource_CONFIRM
• security.gentoo.orgGLSA-202209-24https://security.gentoo.org/glsa/202209-24vendor-advisoryx_refsource_GENTOO