HIGH
CVE-2018-20103
CWE-835Published: December 12, 2018· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.
Technical Analysis
CVE-2018-20103 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
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
ADVISORYhttps://usn.ubuntu.com/3858-1/
ADVISORYhttps://usn.ubuntu.com/3858-1/
All References (14)
→
http://www.securityfocus.com/bid/106280Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHBA-2019:0326Third Party Advisory
→
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
→
https://usn.ubuntu.com/3858-1/Third Party Advisory
→
http://www.securityfocus.com/bid/106280Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHBA-2019:0326Third Party Advisory
→
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
→
https://usn.ubuntu.com/3858-1/Third Party Advisory
Quick Facts
CVE IDCVE-2018-20103
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-835
CISA KEVNo
Affected3 vendor(s)
PublishedDec 12, 2018
Related CVEs (CWE-835)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-20103 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. CVE data is provided under the NVD usage policy.