How severe is CVE-2021-28876?

CVE-2021-28876 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-28876 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28876?

CVE-2021-28876 primarily affects Rust-lang Rust. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28876?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-28876 published?

CVE-2021-28876 was published on 2021-04-11 and last updated on 2026-06-17.

CVE-2021-28876

CVE-2021-28876 is a medium-severity vulnerability in Rust-lang Rust with a CVSS 3.x base score of 5.3. 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-755.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 4.3
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Rust-lang Rust
Published: 2021-04-11
Last modified: 2026-06-17

Description

In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. It calls __iterator_get_unchecked() more than once for the same index when the underlying iterator panics (in certain conditions). This bug could lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.

Frequently asked questions

What is CVE-2021-28876?: In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue. It calls __iterator_get_unchecked() more than once for the same index when the underlying iterator panics (in certain conditions). This bug could lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.
How severe is CVE-2021-28876?: CVE-2021-28876 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-28876 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28876?: CVE-2021-28876 primarily affects Rust-lang Rust. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28876?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28876 published?: CVE-2021-28876 was published on 2021-04-11 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

More vulnerabilities in Rust-lang Rust

CVE-2024-24576 — Critical (CVSS 10.0): Rust is a programming language. The Rust Security Response WG was notified that the Rust standard library prior to…
CVE-2024-3566 — Critical (CVSS 9.8): A command inject vulnerability allows an attacker to perform command injection on Windows applications that indirectly…
CVE-2021-31162 — Critical (CVSS 9.8): In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the…
CVE-2021-28879 — Critical (CVSS 9.8): In the standard library in Rust before 1.52.0, the Zip implementation can report an incorrect size due to an integer…
CVE-2020-36318 — Critical (CVSS 9.8): In the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than…
CVE-2018-1000810 — Critical (CVSS 9.8): The Rust Programming Language Standard Library version 1.29.0, 1.28.0, 1.27.2, 1.27.1, 127.0, 126.2, 126.1, 126.0…

All CVEs affecting Rust-lang Rust →

Other CWE-755 (Improper Handling of Exceptional Conditions) vulnerabilities

CVE-2025-34193 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) Virtual Appliance Host versions prior to 25.1.102 and Application versions prior…
CVE-2025-10156 — Critical (CVSS 9.8): An Improper Handling of Exceptional Conditions vulnerability in the ZIP archive scanning component of mmaitre314…
CVE-2021-42142 — Critical (CVSS 9.8): An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a…
CVE-2021-42141 — Critical (CVSS 9.8): An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with…
CVE-2023-38406 — Critical (CVSS 9.8): bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."
CVE-2022-23121 — Critical (CVSS 9.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Netatalk.…

Browse all CWE-755 (Improper Handling of Exceptional Conditions) vulnerabilities →