CVE-2021-30639 (GCVE-0-2021-30639)
Vulnerability from cvelistv5 – Published: 2021-07-12 14:55 – Updated: 2024-08-03 22:40
VLAI
EPSS
VEX
Title
DoS after non-blocking IO error
Summary
A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64.
Severity
7.5 (High)
CWE
- Denial of Service
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread.html/rd84fae1f474… | x_refsource_MISC |
| https://lists.apache.org/thread.html/r79a7c019712… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r79a7c019712… | mailing-listx_refsource_MLIST |
| https://security.netapp.com/advisory/ntap-2021082… | x_refsource_CONFIRM |
| https://kc.mcafee.com/corporate/index?page=conten… | x_refsource_CONFIRM |
| https://www.oracle.com/security-alerts/cpujan2022.html | x_refsource_MISC |
| https://security.gentoo.org/glsa/202208-34 | vendor-advisoryx_refsource_GENTOO |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
Apache Tomcat 10 10.0.3 to 10.0.4
Affected: Apache Tomcat 9 9.0.44 Affected: Apache Tomcat 8.5 8.5.64 |
guessed |
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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