Denial of service via unbounded invalid-string cache
Published Dec 21, 2022 · Updated Apr 15, 2025
Uncontrolled resource consumption in Brondahl EnumStringValues 4.0.0 and earlier allows attackers to exhaust memory with invalid enum strings. TryParseStringValueToEnum_ViaCache adds attempted strings to a ConcurrentDictionary, while the patch instead prebuilds a finite cache of valid enum strings. Reachability requires a consuming application to use cached parsing on attacker-controlled input; repeated distinct invalid values can exhaust the host process's memory.
Summary
What happened
Uncontrolled resource consumption in Brondahl EnumStringValues 4.0.0 and earlier allows attackers to exhaust memory with invalid enum strings. TryParseStringValueToEnum_ViaCache adds attempted strings to a ConcurrentDictionary, while the patch instead prebuilds a finite cache of valid enum strings. Reachability requires a consuming application to use cached parsing on attacker-controlled input; repeated distinct invalid values can exhaust the host process's memory.
The record
- CVE
- CVE-2020-36620
- Published
- Dec 21, 2022
- Updated
- Apr 15, 2025
- Vendor
- Brondahl
- Product
- EnumStringValues
- Classifications
- CWE-400, T1499
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 21, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=4.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
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Technologies
Your stack
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Your stack
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