CVE-2021-25641
Scores
EPSS
Percentile: 74.6%
CVSS
CVSS Score: 9.8/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Partial
Measures the impact to the confidentiality of information
Integrity Impact
Partial
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Partial
Measures the impact to the availability of the impacted component
Description
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.
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Sources
CWEs
Exploits
Vulnerable Software (1)
Type: Configuration
Vendor: *
Product: dubbo
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.6.9", "versionStartIncluding": "2.5.0", "vulnerable": true }, {...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.6.9", "versionStartIncluding": "2.5.0", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.7.8", "versionStartIncluding": "2.7.0", "vulnerable": true } ], "operator": "OR"}
Source: nvd