How severe is CVE-2021-29937?

CVE-2021-29937 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-2021-29937 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29937?

CVE-2021-29937 affects Telemetry Project Telemetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29937?

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-2021-29937 published?

CVE-2021-29937 was published on 2021-04-01 and last updated on 2026-06-17.

CVE-2021-29937

CVE-2021-29937 is a critical-severity vulnerability in Telemetry Project Telemetry 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-908.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-908
Affected product: Telemetry Project Telemetry
Published: 2021-04-01
Last modified: 2026-06-17

Description

An issue was discovered in the telemetry crate through 2021-02-17 for Rust. There is a drop of uninitialized memory if a value.clone() call panics within misc::vec_with_size().

Frequently asked questions

What is CVE-2021-29937?: An issue was discovered in the telemetry crate through 2021-02-17 for Rust. There is a drop of uninitialized memory if a value.clone() call panics within misc::vec_with_size().
How severe is CVE-2021-29937?: CVE-2021-29937 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-2021-29937 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29937?: CVE-2021-29937 affects Telemetry Project Telemetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29937?: 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-2021-29937 published?: CVE-2021-29937 was published on 2021-04-01 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0046.html

Affected products (1)

cpe:2.3:a:telemetry_project:telemetry:*:*:*:*:*:rust:*:*

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