🛡️ CVE-2021-25641 — dubbo

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-502 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Deserializer tampering in Apache Dubbo

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2021-25641 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2021-25641 is recorded against 2 packages.

  • com.alibaba:dubbo (from 2.5.0 up to 2.6.9)
  • org.apache.dubbo:dubbo (from 2.5.0 up to 2.7.8)

Timeline and source

Published on 18 March 2022 and last revised on 8 November 2023. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
lists.apache.org (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-502
Public Exploit ✅ No
Source OSV
Published 2022-03-18
Updated 2026-08-12
Modified 2023-11-08
Fix URL N/A

Affected Packages

Software From version Fixed in
com.alibaba:dubbo 2.5.0 2.6.9
org.apache.dubbo:dubbo 2.5.0 2.7.8

Similar Threats

Exploit Protection

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