The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
Published 2022-09-28 14:15:10
Updated 2022-11-10 04:00:03
View at NVD,   CVE.org

Threat overview for CVE-2021-43980

Top countries where our scanners detected CVE-2021-43980
Top open port discovered on systems with this issue 80
IPs affected by CVE-2021-43980 417,643
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-43980!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-43980

0.20%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 58 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43980

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
3.7
LOW CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
2.2
1.4
NIST

CWE ids for CVE-2021-43980

References for CVE-2021-43980

Products affected by CVE-2021-43980

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