CVE-2020-27336
No exploitation reported by the sources we read.
- Published2020-12-22
- Fixed in6.0.1.68
- WeaknessCWE-125 · CWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
An issue was discovered in Treck IPv6 before 6.0.1.68. Improper input validation in the IPv6 component when handling a packet sent by an unauthenticated remote attacker could result in an out-of-bounds read of up to three bytes via network access.
Timeline
dates in UTC- 2020-12-2222:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27336?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27336?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.0 | < 6.0.1.68 | 6.0.1.68 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Treck TCP/IP Stack (Update A)
TCP/IP stack IPv6: Version 6.0.1.67 and prior · TCP/IP stack HTTP Server: Version 6.0.1.67 and prior · TCP/IP stack DHCPv6: Version 6.0.1.67 and prior
Fix
- Update Treck ipv6 to 6.0.1.68
- Mitigation from the vendor CISA ICSA-20-353-01 · 3 productsTreck recommends users apply the latest version of the affected products (Treck TCP/IP 6.0.1.68 or later versions). To obtain patches, email security@treck.com
- Mitigation from the vendor CISA ICSA-20-353-01 · 3 productsTreck recommends users who cannot apply the latest patches to implement firewall rules to filter out packets that contain a negative content length in the HTTP header.
- Mitigation from the vendor CISA ICSA-20-353-01 · 3 productsFor more detailed information on the vulnerabilities and the mitigating controls, please see the Treck advisory.
Advisories and patches
- treck.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Published
- 2020-12-22
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-27336?
Is CVE-2020-27336 actively exploited?
What is the CVSS score for CVE-2020-27336?
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Same product first, then the same vendor advisory and the same publication week.