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NVD / CVE Program· CNA mitre

CVE-2021-28876: In the standard library in Rust before 1.52.0, the Zip implementation has a panic safety issue.

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 75.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: rustc (Debian:12) 1.53.0+dfsg1-1; rust-toolset-1.52 (Red Hat:devtools:2021) 0:1.52.1-1.el7_9; rust-toolset-1.52-build (Red Hat:devtools:2021) 0:1.52.1-1.el7_9.

Low priority for now. Upgrade to rustc (Debian:12) 1.53.0+dfsg1-1; rust-toolset-1.52 (Red Hat:devtools:2021) 0:1.52.1-1.el7_9; rust-toolset-1.52-build (Red Hat:devtools:2021) 0:1.52.1-1.el7_9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Apr 11, 2021
Updated
Jun 16, 2026
EPSS
1.5% · 75th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
rust-langrust
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora32
  • fedoraproject fedora33
  • fedoraproject fedora34
  • rust-lang rustbefore 1.52.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12rustcbefore 1.53.0+dfsg1-11.53.0+dfsg1-1
Red Hat:devtools:2021rust-toolset-1.52before 0:1.52.1-1.el7_90:1.52.1-1.el7_9
Red Hat:devtools:2021rust-toolset-1.52-buildbefore 0:1.52.1-1.el7_90:1.52.1-1.el7_9
Red Hat:devtools:2021rust-toolset-1.52-cargobefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-cargo-docbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-clippybefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rlsbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-runtimebefore 0:1.52.1-1.el7_90:1.52.1-1.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rustbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-analysisbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-debugger-commonbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-debuginfobefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-docbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-gdbbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-lldbbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-srcbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rust-std-staticbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:devtools:2021rust-toolset-1.52-rustfmtbefore 0:1.52.1-2.el7_90:1.52.1-2.el7_9
Red Hat:enterprise_linux:8::appstreamcargobefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9
Red Hat:enterprise_linux:8::appstreamcargo-debuginfobefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9
Red Hat:enterprise_linux:8::appstreamcargo-docbefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9
Red Hat:enterprise_linux:8::appstreamclippybefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9
Red Hat:enterprise_linux:8::appstreamclippy-debuginfobefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9
Red Hat:enterprise_linux:8::appstreamrlsbefore 0:1.52.1-1.module+el8.4.0+11282+0729bac90:1.52.1-1.module+el8.4.0+11282+0729bac9

+16

Same product

rust-lang: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-31162In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics.
    40Plan
  • CVE-2021-28879In the standard library in Rust before 1.52.0, the Zip implementation can report an incorrect size due to an integer overflow.
    40Plan
  • CVE-2020-36318In the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than once under certain c
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2020-36317Apr 11, 2021 · In the standard library in Rust before 1.49.0, String::retain() function has a panic safety problem.
    30Monitor
  • ← EarlierCVE-2021-28875Apr 11, 2021 · In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context.
    31Monitor
  • Later →CVE-2021-28877Apr 11, 2021 · In the standard library in Rust before 1.51.0, the Zip implementation calls __iterator_get_unchecked() for the same index more than once whe
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:rustc1.53.0+dfsg1-1 · Debian:12Package registry (OSV)
red hat:rust-toolset-1.520:1.52.1-1.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-build0:1.52.1-1.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-cargo0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-cargo-doc0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-clippy0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rls0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-runtime0:1.52.1-1.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rust0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rust-analysis0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rust-debugger-common0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rust-debuginfo0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
red hat:rust-toolset-1.52-rust-doc0:1.52.1-2.el7_9 · Red Hat:devtools:2021Package registry (OSV)
rocky linux:rust0:1.52.1-1.module+el8.4.0+641+ca238f88 · Rocky Linux:8Package registry (OSV)
rocky linux:rust-toolset0:1.52.1-1.module+el8.4.0+641+ca238f88 · Rocky Linux:8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-755 · Improper Handling of Exceptional Conditions

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records