dbcve.org
Dd WrtOperating system

CVE-2022-27631

CRITICAL · 9.8 CVSS v3.1 Published 2022-08-05
Fix available
A fix is available. Upgrade to after 48599 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

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 memory corruption vulnerability exists in the httpd unescape functionality of DD-WRT Revision 32270 - Revision 48599. A specially-crafted HTTP request can lead to memory corruption. An attacker can send a network request to trigger this vulnerability.

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
How this class of weakness works · CWE-787

The program writes past the bounds of a buffer, overwriting adjacent memory an attacker can turn to their advantage. Crafted input can overwrite control data and redirect execution. Remediation is validating every index and length before a write, plus modern memory-safety mitigations.

General guidance for the out-of-bounds write class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Dd WrtOperating system
Affected:>= 32270, <= 48599

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 48599
Recommended fix Moderate confidence

DD-WRT revision newer than 48599 (e.g., revision 48600 or later releases)

  1. 1. Identify the current DD-WRT revision by accessing the web interface or running 'nvram get os_revision' via telnet/SSH
  2. 2. Navigate to the DD-WRT download page at https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/ or https://download.dd-wrt.com/dd-wrtv2/downloads/
  3. 3. Locate a firmware revision newer than 48599 (e.g., revision 48600 or later)
  4. 4. Download the appropriate firmware for your specific router model
  5. 5. Access the DD-WRT web interface, go to Administration > Firmware Upgrade
  6. 6. Upload the new firmware file and wait for the upgrade to complete
  7. 7. Verify the new revision number post-upgrade using 'nvram get os_revision'
Caveat Router firmware upgrades may reset configuration to defaults; backup current settings before upgrading

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 $3,550. 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-2022-27631 in production — separate from our analysis above.

No notes yet

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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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