What is CVE-2021-45703?

An issue was discovered in the tectonic_xdv crate before 0.1.12 for Rust. XdvParser:: ::process may read from uninitialized memory locations.

How severe is CVE-2021-45703?

CVE-2021-45703 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-2021-45703 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45703?

CVE-2021-45703 affects Tectonic Xdv Project Tectonic Xdv. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45703?

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-2021-45703 published?

CVE-2021-45703 was published on 2021-12-27 and last updated on 2026-06-17.

CVE-2021-45703

CVE-2021-45703 is a critical-severity vulnerability in Tectonic Xdv Project Tectonic Xdv 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% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-908
Affected product: Tectonic Xdv Project Tectonic Xdv
Published: 2021-12-27
Last modified: 2026-06-17

Description

An issue was discovered in the tectonic_xdv crate before 0.1.12 for Rust. XdvParser::<T>::process may read from uninitialized memory locations.

Frequently asked questions

What is CVE-2021-45703?: An issue was discovered in the tectonic_xdv crate before 0.1.12 for Rust. XdvParser::<T>::process may read from uninitialized memory locations.
How severe is CVE-2021-45703?: CVE-2021-45703 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-2021-45703 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45703?: CVE-2021-45703 affects Tectonic Xdv Project Tectonic Xdv. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45703?: 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-2021-45703 published?: CVE-2021-45703 was published on 2021-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tectonic_xdv_project:tectonic_xdv:*:*:*:*:*:rust:*:*

Other CWE-908 (Use of Uninitialized Resource) vulnerabilities

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CVE-2021-45693 — Critical (CVSS 9.8): An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read…

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