How severe is CVE-2021-29954?

CVE-2021-29954 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-29954 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29954?

CVE-2021-29954 affects Mozilla Hubs Cloud Reticulum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29954?

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

When was CVE-2021-29954 published?

CVE-2021-29954 was published on 2021-06-24 and last updated on 2026-06-17.

CVE-2021-29954

CVE-2021-29954 is a critical-severity vulnerability in Mozilla Hubs Cloud Reticulum with a CVSS 3.x base score of 9.8. 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-312.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-312
Affected product: Mozilla Hubs Cloud Reticulum
Published: 2021-06-24
Last modified: 2026-06-17

Description

Proxy functionality built into Hubs Cloud’s Reticulum software allowed access to internal URLs, including the metadata service. This vulnerability affects Hubs Cloud < mozillareality/reticulum/1.0.1/20210428201255.

Frequently asked questions

What is CVE-2021-29954?: Proxy functionality built into Hubs Cloud’s Reticulum software allowed access to internal URLs, including the metadata service. This vulnerability affects Hubs Cloud < mozillareality/reticulum/1.0.1/20210428201255.
How severe is CVE-2021-29954?: CVE-2021-29954 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-29954 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29954?: CVE-2021-29954 affects Mozilla Hubs Cloud Reticulum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29954?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-29954 published?: CVE-2021-29954 was published on 2021-06-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:hubs_cloud_reticulum:*:*:*:*:*:*:*:*

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