CVE-2021-23386
Remote Memory Exposure
MEDIUM
6.5
CVSS Score
Published: May 20, 2021 at 04:15 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
1 product affected across 1 vendorDNS Packet
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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
Description
This affects the package dns-packet before 5.2.2. It creates buffers with allocUnsafe and does not always fill them before forming network packets. This can expose internal application memory over unencrypted network when querying crafted invalid domain names.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.3.4v < 5.2.22.0.0 ≤ v < 5.2.2
Affected range stops below 1.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.2, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/mafintosh/dns-packet/commit/25f15dd0fedc53688b25fd053ebbdffe3d5c1c56x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/bugs?subject=user&%3Breport_id=968858x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1295719x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://snyk.io/vuln/SNYK-JS-DNSPACKET-1293563CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-909
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