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Vulnerability details: VCID-w3w7-upq4-aaam
Vulnerability ID VCID-w3w7-upq4-aaam
Aliases CVE-2019-18801
Summary CVE-2019-18801 envoy: an untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-131 Incorrect Calculation of Buffer Size
System Score Found at
cvssv3 8.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18801.json
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rhbs urgent https://bugzilla.redhat.com/show_bug.cgi?id=1773444
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-18801
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-18801
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-18801
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2019:4222
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18801.json
https://api.first.org/data/v1/epss?cve=CVE-2019-18801
https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/commits/master
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp
https://groups.google.com/forum/#%21forum/envoy-users
https://groups.google.com/forum/#!forum/envoy-users
1773444 https://bugzilla.redhat.com/show_bug.cgi?id=1773444
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
CVE-2019-18801 https://nvd.nist.gov/vuln/detail/CVE-2019-18801
ISTIO-SECURITY-2019-007 https://istio.io/latest/news/security/ISTIO-SECURITY-2019-007/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-18801.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-18801
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-18801
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-18801
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.10461
EPSS Score 0.00044
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.