THREATPORT/VULNERABILITY/CVE-2019-18277
HIGH SEVERITY

CVE-2019-18277

Haproxy vulnerability

CVSS
7.5
EPSS
10.0%
EPSS pct
95th
Exploited
No known
A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).
Affected vendor
Haproxy
Affected product
Haproxy
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness type (CWE)
Published
2019-10-23

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 10.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2019-18277

  • Confirm whether Haproxy Haproxy is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-18277.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-18277

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-18277 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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