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Vulnerability details: VCID-k6p6-jgh7-aaah
Vulnerability ID VCID-k6p6-jgh7-aaah
Aliases CVE-2021-39156
GHSA-hqxw-mm44-gc4r
Summary Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-706 Use of Incorrectly-Resolved Name or Reference
CWE-863 Incorrect Authorization
System Score Found at
rhas Important https://access.redhat.com/errata/RHSA-2021:3272
rhas Important https://access.redhat.com/errata/RHSA-2021:3273
cvssv3 8.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39156.json
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epss 0.00607 https://api.first.org/data/v1/epss?cve=CVE-2021-39156
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1996915
cvssv3.1 7.6 https://github.com/istio/istio
generic_textual HIGH https://github.com/istio/istio
cvssv3.1 8.1 https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r
generic_textual HIGH https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r
cvssv3.1 8.1 https://istio.io/latest/news/security/istio-security-2021-008
generic_textual HIGH https://istio.io/latest/news/security/istio-security-2021-008
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-39156
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-39156
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-39156
archlinux High https://security.archlinux.org/AVG-2321
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39156.json
https://api.first.org/data/v1/epss?cve=CVE-2021-39156
https://github.com/istio/istio
https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r
https://istio.io/latest/news/security/istio-security-2021-008
1996915 https://bugzilla.redhat.com/show_bug.cgi?id=1996915
AVG-2321 https://security.archlinux.org/AVG-2321
cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
CVE-2021-39156 https://nvd.nist.gov/vuln/detail/CVE-2021-39156
ISTIO-SECURITY-2021-008 https://istio.io/latest/news/security/ISTIO-SECURITY-2021-008/
RHSA-2021:3272 https://access.redhat.com/errata/RHSA-2021:3272
RHSA-2021:3273 https://access.redhat.com/errata/RHSA-2021:3273
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-39156.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: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N Found at https://github.com/istio/istio
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:R/S:U/C:H/I:H/A:N Found at https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r
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:R/S:U/C:H/I:H/A:N Found at https://istio.io/latest/news/security/istio-security-2021-008
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:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-39156
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:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-39156
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:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-39156
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 0.50118
EPSS Score 0.00140
Published At Dec. 17, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.