ArenavecApplication · Arenavec Project
CVE-2021-29931
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn issue was discovered in the arenavec crate through 2021-01-12 for Rust. A double drop can sometimes occur upon a panic in T::drop().
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe arenavec Rust crate has a double-drop vulnerability where a value's destructor can be called twice when a panic occurs during the drop implementation (T::drop()). This leads to undefined behavior including potential use-after-free, resource corruption, or memory safety issues.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
ArenavecApplication
<= 2021-01-12CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Locate arenavec in dependenciesSearch your project for 'arenavec' in Cargo.toml and Cargo.lock files, or run `cargo tree -p arenavec` if the project buildsAffected if arenavec is not found in the project dependencies, so the vulnerability does not apply
-
Identify installed arenavec versionCheck the version number listed next to arenavec in Cargo.lock, or run `cargo info arenavec` to see available versions and datesAffected if The installed version is dated 2021-01-12 or earlier, or the version number is <= the vulnerable release
-
Determine if vulnerable code path is exercisedReview code that uses arenavec collections (Vec, HashMap, etc.) and check whether stored types implement Drop with logic that could panic, or whether drop guards are used that might panic during unwindingAffected if The code stores types with Drop implementations that can panic and uses arenavec collections that trigger the double-drop during panic unwinding
-
Inspect Cargo.lock for transitive dependenciesRun `cargo tree -i arenavec` to find all packages that depend on arenavec, then check each dependent crate's usage patternsAffected if A transitive dependency pulls in a vulnerable arenavec version and uses it in a way that triggers the double-drop condition
You are affected if arenavec version <= 2021-01-12 is present AND your code (or a dependency) stores types with panicking Drop implementations in arenavec collections, causing undefined behavior during panic unwinding.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade to a patched version of arenavec that prevents the double-drop condition, or if no patch is available, audit and modify the crate's drop implementation to use ManuallyDrop or equivalent patterns to ensure single-drop semantics.
Fix this in Arenavec
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-29931 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-29931 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data