WAVM up to 2018-07-26 WebAssembly Virtual Machine input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability has been found in WAVM up to 2018-07-26 and classified as problematic. Affected by this vulnerability is an unknown function of the component WebAssembly Virtual Machine. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

In WAVM through 2018-07-26, a crafted file sent to the WebAssembly Virtual Machine may cause a denial of service (application crash) or possibly have unspecified other impact because a certain new_allocator allocate call fails.

The bug was discovered 07/26/2018. The weakness was released 09/10/2018 (Website). The advisory is shared at github.com. This vulnerability is known as CVE-2018-16770 since 09/09/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 46 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at 123780, 123779, 123778 and 123777.




CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Input validation
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍


07/26/2018 🔍
09/09/2018 +44 days 🔍
09/10/2018 +1 days 🔍
09/10/2018 +0 days 🔍
09/10/2018 +0 days 🔍
05/07/2023 +1700 days 🔍


Advisory: 100
Status: Not defined

CVE: CVE-2018-16770 (🔍)
See also: 🔍


Created: 09/10/2018 07:35 AM
Updated: 05/07/2023 05:06 PM
Changes: 09/10/2018 07:35 AM (56), 03/22/2020 08:28 AM (1), 05/07/2023 05:06 PM (3)
Complete: 🔍


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