CVE-2021-23386
MEDIUMCVSS 6.5/10EPSS 1.43%
Last modified
CVE-2021-23386 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.43% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Dns-Packet Project | Dns-Packet | < 1.3.4 |
| Dns-Packet Project | Dns-Packet | >= 2.0.0, < 5.2.2 |
References
- https://github.com/mafintosh/dns-packet/commit/25f15dd0fedc53688b25fd053ebbdffe3d5c1c56Patch, Third Party Advisory
- https://hackerone.com/bugs?subject=user&%3Breport_id=968858Permissions Required, Third Party Advisory
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1295719Patch, Third Party Advisory
- https://snyk.io/vuln/SNYK-JS-DNSPACKET-1293563Patch, Third Party Advisory
- https://github.com/mafintosh/dns-packet/commit/25f15dd0fedc53688b25fd053ebbdffe3d5c1c56Patch, Third Party Advisory
- https://hackerone.com/bugs?subject=user&%3Breport_id=968858Permissions Required, Third Party Advisory
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1295719Patch, Third Party Advisory
- https://snyk.io/vuln/SNYK-JS-DNSPACKET-1293563Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23386?
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.
How severe is CVE-2021-23386?
CVE-2021-23386 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23386?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-23380This affects all versions of package roar-pidusage. If attac…7.3
- CVE-2021-23381This affects all versions of package killing. If attacker-co…9.8
- CVE-2021-23382The package postcss before 8.2.13 are vulnerable to Regular …7.5
- CVE-2021-23383The package handlebars before 4.7.7 are vulnerable to Protot…9.8
- CVE-2021-23384The package koa-remove-trailing-slashes before 2.0.2 are vul…5.4
- CVE-2021-23385This affects all versions of package Flask-Security. When us…6.1
- CVE-2021-23387The package trailing-slash before 2.0.1 are vulnerable to Op…6.1
- CVE-2021-23388The package forms before 1.2.1, from 1.3.0 and before 1.3.2 …5.3
- CVE-2021-23389The package total.js before 3.4.9 are vulnerable to Arbitrar…9.8
- CVE-2021-2339Vulnerability in the MySQL Server product of Oracle MySQL (c…4.9
- CVE-2021-23390The package total4 before 0.0.43 are vulnerable to Arbitrary…9.8
- CVE-2021-23391This affects all versions of package calipso. It is possible…7.1
Are you affected by CVE-2021-23386?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST