01 Record

CVE-2019-18277

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 10.02% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 95.2% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2019-10-23 13:07Z6 YR AGO

Last updated

2024-08-05 01:47Z2 YR AGO

Reserved

2019-10-23

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base

Data version

5.1

Document digest

825e8cf31efbda02bc0a1580ebd0a807f13f58c735aaf49ac3b25fb26a36225c

05 Affected products

VendorProductVersionsPlatforms

haproxyhaproxyNot specified—

redhatenterprise_linuxNot specified—

redhatopenshiftNot specified—

redhatrhel_software_collectionsNot specified—

06 References

www.mail-archive.comhttps://www.mail-archive.com/haproxy%40formilux.org/msg34926.htmlx_refsource_MISC
nathandavison.comhttps://nathandavison.com/blog/haproxy-http-request-smugglingx_refsource_MISC
git.haproxy.orghttps://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581x_refsource_MISC
usn.ubuntu.comUSN-4174-1https://usn.ubuntu.com/4174-1/vendor-advisoryx_refsource_UBUNTU
lists.opensuse.orgopenSUSE-SU-2019:2626http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.htmlvendor-advisoryx_refsource_SUSE
lists.opensuse.orgopenSUSE-SU-2019:2645http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.htmlvendor-advisoryx_refsource_SUSE
lists.debian.org[debian-lts-announce] 20220530 [SECURITY] [DLA 3034-1] haproxy security updatehttps://lists.debian.org/debian-lts-announce/2022/05/msg00045.htmlmailing-listx_refsource_MLIST

01 Record index

CVE-2019-18277

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2019-18277

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References