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CVE-2020-36512

InputStream::read_exact : `Read` on uninitialized buffer causes UB

9.8 Critical

An issue was discovered in the buffoon crate through 2020-12-31 for Rust. InputStream::read_exact may read from uninitialized memory locations.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.23%Up 0.6 points since Dec 27, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

An issue was discovered in the buffoon crate through 2020-12-31 for Rust. InputStream::read_exact may read from uninitialized memory locations.

Record
CVE-2020-36512
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-908
Updated
2026-11-02
CVE List No score

An issue was discovered in the buffoon crate through 2020-12-31 for Rust. InputStream::read_exact may read from uninitialized memory locations.

Record
CVE-2020-36512
Updated
2026-11-02
EUVDEUVD-2022-0699 No score

An issue was discovered in the buffoon crate through 2020-12-31 for Rust. InputStream::read_exact may read from uninitialized memory locations.

Record
EUVD-2022-0699
Updated
2026-11-03
GitHub AdvisoriesGHSA-v938-qcc9-rwv8 9.8

Use of Uninitialized Resource in buffoon.

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation. Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

Record
GHSA-v938-qcc9-rwv8
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-908
Updated
2026-11-02
GitHub AdvisoriesGHSA-hmx9-jm3v-33hv No score

InputStream::read_exact : `Read` on uninitialized buffer causes UB

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation. Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

Record
GHSA-hmx9-jm3v-33hv
Updated
2026-11-02
OSVGHSA-v938-qcc9-rwv8 9.8

Use of Uninitialized Resource in buffoon.

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation. Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

Record
GHSA-v938-qcc9-rwv8
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-908
Updated
2026-11-02
OSVGHSA-hmx9-jm3v-33hv No score

InputStream::read_exact : `Read` on uninitialized buffer causes UB

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation. Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

Record
GHSA-hmx9-jm3v-33hv
Updated
2026-11-02
OSVRUSTSEC-2020-0154 No score

InputStream::read_exact : `Read` on uninitialized buffer causes UB

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation.

Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

Record
RUSTSEC-2020-0154
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
buffoon
crates.io
through 0.5.0 None known
buffoon
crates.io
0.0.0-0 and later None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-36512 is a critical vulnerability (CVSS 9.8) in Buffoon Project Buffoon, published December 31, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.23%, the 69th percentile. No source names a fixed version.

References

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