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No exploitation reportedFix available

CVE-2021-25900

No exploitation reported by the sources we read.

  • Published2021-01-26
  • Fixed in1.6.1 · 0.6.14
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust. There is a heap-based buffer overflow in SmallVec::insert_many.

Timeline

dates in UTC
  1. 2021-01-2618:16CVE publishedNVD

Versions per branch

NVD · OSV
Servo smallvec
BranchAffectedFixed in
1.x≥ 1.0.0, < 1.6.11.6.1
0.6≥ 0.6.3, < 0.6.140.6.14

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • librsvgSUSE:Linux Enterprise Module for Desktop Applications 15 SP2all versions · fixed in 2.46.5-3.3.1
  • librsvgSUSE:Linux Enterprise Module for Basesystem 15 SP2all versions · fixed in 2.46.5-3.3.1
  • librsvgopenSUSE:Leap 15.2all versions · fixed in 2.46.5-lp152.2.3.1
  • librsvgMageia:7all versions · fixed in 2.45.5-3.2.mga7
  • rust-smallvecUbuntu:26.10all versions · no fixed version listed
  • rust-smallvecUbuntu:26.04:LTSall versions · no fixed version listed
  • rust-smallvecUbuntu:25.10all versions · no fixed version listed
  • rust-smallvecUbuntu:24.04:LTSall versions · no fixed version listed

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-25900 Red Hat Product Security

    rust-smallvec: heap-based buffer overflow in SmallVec::insert_many

Full record on NVD

Fix

  1. Update Servo smallvec to 1.6.1 · 0.6.14

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score1.7 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryCRITICAL2022-06-17

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-01-26
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-43w2-9j62-hq99

Frequently asked questions

What is CVE-2021-25900?

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust. There is a heap-based buffer overflow in SmallVec::insert_many.

Is CVE-2021-25900 actively exploited?

Active exploitation of CVE-2021-25900 has not been confirmed. Its EPSS score was 1.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-25900?

CVE-2021-25900 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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