MEDIUM
CVE-2020-29129
CWE-125Published: November 26, 2020· Updated: Jun 17, 2026
4.3
CVSS v3.1
Official Description
ncsi.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of header data even if that exceeds the total packet length.
Technical Analysis
CVE-2020-29129 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Affected Vendors & Products
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
libslirp_project1 product(s)
libslirp
Source: NVD CPE · 4 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
http://www.openwall.com/lists/oss-security/2020/11/27/1Mailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List · Third Party Advisory
→
https://lists.freedesktop.org/archives/slirp/2020-November/000115.htmlMailing List · Vendor Advisory
→
http://www.openwall.com/lists/oss-security/2020/11/27/1Mailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List · Third Party Advisory
→
https://lists.freedesktop.org/archives/slirp/2020-November/000115.htmlMailing List · Vendor Advisory
Quick Facts
CVE IDCVE-2020-29129
CVSS Score4.3 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected3 vendor(s)
PublishedNov 26, 2020
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-29129 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.