How severe is CVE-2020-36323?

CVE-2020-36323 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2020-36323 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36323?

CVE-2020-36323 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-2020-36323?

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.

When was CVE-2020-36323 published?

CVE-2020-36323 was published on 2021-04-14 and last updated on 2026-06-17.

CVE-2020-36323

CVE-2020-36323 is a high-severity vulnerability in Rust-lang Rust with a CVSS 3.x base score of 8.2. 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-134.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 6.4
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-134
Affected product: Rust-lang Rust
Published: 2021-04-14
Last modified: 2026-06-17

Description

In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.

Frequently asked questions

What is CVE-2020-36323?: In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.
How severe is CVE-2020-36323?: CVE-2020-36323 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2020-36323 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36323?: CVE-2020-36323 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-2020-36323?: 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.
When was CVE-2020-36323 published?: CVE-2020-36323 was published on 2021-04-14 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-134 vulnerabilities

CVE-2012-1851 — Critical (CVSS 10.0): Format string vulnerability in the Print Spooler service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2,…
CVE-2012-0242 — Critical (CVSS 10.0): Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary…
CVE-2011-2475 — Critical (CVSS 10.0): Format string vulnerability in ECTrace.dll in the iMailGateway service in the Internet Mail Gateway in OneBridge Server…
CVE-2011-1568 — Critical (CVSS 10.0): Format string vulnerability in the logText function in shmemmgr9.dll in IGSSdataServer.exe 9.00.00.11074, and…
CVE-2010-4235 — Critical (CVSS 10.0): Format string vulnerability in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server…
CVE-2011-0270 — Critical (CVSS 10.0): Format string vulnerability in nnmRptConfig.exe in HP OpenView Network Node Manager (OV NNM) 7.51 and 7.53 allows…

Browse all CWE-134 vulnerabilities →