CVE-2021-37136

CVE-2021-37136 is a high-severity vulnerability in Netty with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 5.0
• EPSS exploit prediction: 6% (92nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-400
• Affected product: Netty
• Published: 2021-10-19
• Last modified: 2026-06-17

Description

The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack

Frequently asked questions

What is CVE-2021-37136?

The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack

How severe is CVE-2021-37136?

CVE-2021-37136 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-37136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37136?

CVE-2021-37136 primarily affects Netty. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-37136 published?

CVE-2021-37136 was published on 2021-10-19 and last updated on 2026-06-17.

References

• https://github.com/netty/netty/security/advisories/GHSA-grg4-wf29-r9vv
• https://lists.apache.org/thread.html/r06a145c9bd41a7344da242cef07977b24abe3349161ede948e30913d%40%3Ccommits.druid.apache.org%3E
• https://lists.apache.org/thread.html/r5406eaf3b07577d233b9f07cfc8f26e28369e6bab5edfcab41f28abb%40%3Ccommits.druid.apache.org%3E
• https://lists.apache.org/thread.html/r5e05eba32476c580412f9fbdfc9b8782d5b40558018ac4ac07192a04%40%3Ccommits.druid.apache.org%3E
• https://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
• https://lists.apache.org/thread.html/rd262f59b1586a108e320e5c966feeafbb1b8cdc96965debc7cc10b16%40%3Ccommits.druid.apache.org%3E
• https://lists.apache.org/thread.html/rfb2bf8597e53364ccab212fbcbb2a4e9f0a9e1429b1dc08023c6868e%40%3Cdev.tinkerpop.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
• https://security.netapp.com/advisory/ntap-20220210-0012/
• https://www.debian.org/security/2023/dsa-5316
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html

Affected products (38)

• cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
• cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_apis:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_apis:19.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_apis:19.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_apis:20.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_apis:21.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:18.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:18.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:18.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:19.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:19.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:20.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:banking_digital_experience:21.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:coherence:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:coherence:14.1.1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:12:0.0.5.0:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.10.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.7.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_cloud_native_core_unified_data_repository:1.15.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_instant_messaging_server:8.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:helidon:1.4.10:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:helidon:2.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.48:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:webcenter_portal:12.2.1.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:webcenter_portal:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

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