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FedoraOperating system · Fedoraproject

CVE-2021-44847

CRITICAL · 9.8 CVSS v3.1 Published 2021-12-13
Fix available
A fix is available. Upgrade to after 0.2.12 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click Patch available

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 · unedited
A stack-based buffer overflow in handle_request function in DHT.c in toxcore 0.1.9 through 0.1.11 and 0.2.0 through 0.2.12 (caused by an improper length calculation during the handling of received network packets) allows remote attackers to crash the process or potentially execute arbitrary code via a network packet.

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

A detailed technical summary for this CVE is being prepared.

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
FedoraOperating system
Affected:= 34= 35
ToxcoreApplication
Affected:>= 0.1.9, <= 0.1.11>= 0.2.0, <= 0.2.12

CVSS 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
High
Integrity
High
Availability
High

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

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.

dbcve · scoped
Upgrade available Upgrade to a release after 0.2.12
Vendor patch github.com →
Recommended fix High confidence

toxcore >= 0.2.13 (or latest stable release)

  1. 1. Identify the toxcore version currently installed in your system
  2. 2. For source-based installations: Download toxcore version 0.2.13 or later from the official repository at https://github.com/TokTok/c-toxcore
  3. 3. Compile and install the new version following the build instructions in the repository
  4. 4. For Fedora systems: Run 'dnf update' to apply the patched packages provided by Fedora
  5. 5. Restart any services or applications that depend on toxcore to load the patched library
  6. 6. Verify the installed version is 0.2.13 or later, or that the DHT.c file contains the fix from PR #1718
Caveat Minor: Verify compatibility with any custom toxcore-based applications after upgrading, as API/ABI changes may occur in minor version updates

Generated from the published advisory — verify against the referenced sources before acting.

We can identify the exact fixed release, upgrade, and verify it in staging — typical engagement from $2,300. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-44847 in production — separate from our analysis above.

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What this is

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What belongs here
  • 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
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