How severe is CVE-2023-0163?

CVE-2023-0163 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-0163 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-0163?

CVE-2023-0163 affects Mozilla Convict. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-0163?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-0163 have an EU (EUVD) identifier?

Yes. CVE-2023-0163 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-0329.

When was CVE-2023-0163 published?

CVE-2023-0163 was published on 2024-11-26 and last updated on 2026-06-17.

CVE-2023-0163

CVE-2023-0163 is a high-severity vulnerability in Mozilla Convict with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-0329
Weakness: CWE-1321
Affected product: Mozilla Convict
Published: 2024-11-26
Last modified: 2026-06-17

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Mozilla Convict. This allows an attacker to inject attributes that are used in other components, or to override existing attributes with ones that have incompatible type, which may lead to a crash. The main use case of Convict is for handling server-side configurations written by the admins owning the servers, and not random users. So it's unlikely that an admin would deliberately sabotage their own server. Still, a situation can happen where an admin not knowledgeable about JavaScript could be tricked by an attacker into writing the malicious JavaScript code into some config files. This issue affects Convict: before 6.2.4.

Frequently asked questions

What is CVE-2023-0163?: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Mozilla Convict. This allows an attacker to inject attributes that are used in other components, or to override existing attributes with ones that have incompatible type, which may lead to a crash. The main use case of Convict is for handling server-side configurations written by the admins owning the servers, and not random users. So it's unlikely that an admin would deliberately sabotage their own server. Still, a situation can happen where an admin not knowledgeable about JavaScript could be tricked by an attacker into writing the malicious JavaScript code into some config files. This issue affects Convict: before 6.2.4.
How severe is CVE-2023-0163?: CVE-2023-0163 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-0163 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-0163?: CVE-2023-0163 affects Mozilla Convict. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-0163?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-0163 have an EU (EUVD) identifier?: Yes. CVE-2023-0163 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-0329.
When was CVE-2023-0163 published?: CVE-2023-0163 was published on 2024-11-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:convict:*:*:*:*:*:node.js:*:*

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