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TI-2021-07774 Aliases CVE-2021-25641GHSA-v2rg-8cwr-75g8

Dubbo Zookeeper does not check serialization id

Priority MEDIUM 61CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

Each Apache Dubbo server will set a serialization id to tell the clients which serialization protocol it is working on. But for Dubbo versions before 2.7.8 or 2.6.9, an attacker can choose which serialization id the Provider will use by tampering with the byte preamble flags, aka, not following the server's instruction. This means that if a weak deserializer such as the Kryo and FST are somehow in code scope (e.g. if Kryo is somehow a part of a dependency), a remote unauthenticated attacker can tell the Provider to use the weak deserializer, and then proceed to exploit it.

Why it matters now

EPSS 0.21221 97th percentileScored 2026-11-08
Fix Fixed Apache Dubbo (Apache Software Foundation): 2.7.8, 2.6.9org.apache.dubbo:dubbo (Maven): 2.7.8+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache DubboApache Dubbo 2.7.x to before 2.7.8; Apache Dubbo 2.6.x to before 2.6.92.7.8, 2.6.9Patch availableCNA
—org.apache.dubbo:dubbo (Maven)2.5.0 to before 2.7.82.7.8Patch availableGHSA-v2rg-8cwr-75g8
—com.alibaba:dubbo (Maven)2.5.0 to before 2.6.92.6.9Patch availableGHSA-v2rg-8cwr-75g8
  • Apache Dubbo VendorApache Affected Apache Dubbo 2.7.x to before 2.7.8; Apache Dubbo 2.6.x to before 2.6.9 Fixed in 2.7.8, 2.6.9 Patch available CNA
  • org.apache.dubbo:dubbo (Maven) Vendor— Affected 2.5.0 to before 2.7.8 Fixed in 2.7.8 Patch available GHSA-v2rg-8cwr-75g8
  • com.alibaba:dubbo (Maven) Vendor— Affected 2.5.0 to before 2.6.9 Fixed in 2.6.9 Patch available GHSA-v2rg-8cwr-75g8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*2.5.0 to before 2.6.9; 2.7.0 to before 2.7.8VulnerableApache
  • cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:* Versions 2.5.0 to before 2.6.9; 2.7.0 to before 2.7.8 Vulnerable ·Apache

Remediation

  • Fix · CNA Apache Dubbo (Apache Software Foundation) Fixed in 2.7.8, 2.6.9
  • Fix · GHSA-v2rg-8cwr-75g8 org.apache.dubbo:dubbo (Maven) Fixed in 2.7.8 Advisory →
  • Fix · GHSA-v2rg-8cwr-75g8 com.alibaba:dubbo (Maven) Fixed in 2.6.9 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-25641
  2. 2026-10-03 Alias added: GHSA-v2rg-8cwr-75g8

References

Advisory 2

  • TI-2021-12489 Regular expression Denial of Service in MooTools CVSS 3.1CRITICAL 9.8
  • TI-2021-10721 Apache Dubbo RCE on customers via Script route poisoning (Nashorn script injection) CVSS 3.1CRITICAL 9.8
  • TI-2021-10720 Apache Dubbo RCE on customers via Condition route poisoning (Unsafe YAML unmarshaling) CVSS 3.1CRITICAL 9.8
  • TI-2019-13107 Deserialization of untrusted data in Apache Dubbo CVSS 3.1CRITICAL 9.8
  • TI-2021-19290 Dubbo Hessian cause RCE when parse error CVSS 3.1CRITICAL 9.8
  • TI-2020-01872 Deserialization of untrusted data in Apache Dubbo CVSS 3.1CRITICAL 9.8
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences