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Vulnerability details: VCID-a3bj-tpnb-ekc8
Vulnerability ID VCID-a3bj-tpnb-ekc8
Aliases CVE-2016-8616
Summary A flaw was found in curl before version 7.51.0 When re-using a connection, curl was doing case insensitive comparisons of user name and password with the existing connections. This means that if an unused connection with proper credentials exists for a protocol that has connection-scoped credentials, an attacker can cause that connection to be reused if s/he knows the case-insensitive version of the correct password.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-178 Improper Handling of Case Sensitivity
CWE-287 Improper Authentication
CWE-255 Credentials Management Errors
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8616.json
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
epss 0.03552 https://api.first.org/data/v1/epss?cve=CVE-2016-8616
cvssv3.1 Medium https://curl.se/docs/CVE-2016-8616.html
cvssv2 1.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2016-8616
cvssv3 5.9 https://nvd.nist.gov/vuln/detail/CVE-2016-8616
archlinux High https://security.archlinux.org/AVG-60
archlinux High https://security.archlinux.org/AVG-61
archlinux High https://security.archlinux.org/AVG-62
archlinux High https://security.archlinux.org/AVG-63
archlinux High https://security.archlinux.org/AVG-65
archlinux High https://security.archlinux.org/AVG-66
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2018:2486
https://access.redhat.com/errata/RHSA-2018:3558
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8616.json
https://api.first.org/data/v1/epss?cve=CVE-2016-8616
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8616
https://curl.haxx.se/CVE-2016-8616.patch
https://curl.haxx.se/docs/adv_20161102B.html
https://curl.se/docs/CVE-2016-8616.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8615
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8616
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8617
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8618
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8619
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8620
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8621
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8622
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8623
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8624
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/201701-47
https://www.tenable.com/security/tns-2016-21
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/94094
http://www.securitytracker.com/id/1037192
1388371 https://bugzilla.redhat.com/show_bug.cgi?id=1388371
ASA-201611-10 https://security.archlinux.org/ASA-201611-10
ASA-201611-4 https://security.archlinux.org/ASA-201611-4
ASA-201611-5 https://security.archlinux.org/ASA-201611-5
ASA-201611-7 https://security.archlinux.org/ASA-201611-7
ASA-201611-8 https://security.archlinux.org/ASA-201611-8
ASA-201611-9 https://security.archlinux.org/ASA-201611-9
AVG-60 https://security.archlinux.org/AVG-60
AVG-61 https://security.archlinux.org/AVG-61
AVG-62 https://security.archlinux.org/AVG-62
AVG-63 https://security.archlinux.org/AVG-63
AVG-65 https://security.archlinux.org/AVG-65
AVG-66 https://security.archlinux.org/AVG-66
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
CVE-2016-8616 https://nvd.nist.gov/vuln/detail/CVE-2016-8616
USN-3123-1 https://usn.ubuntu.com/3123-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8616.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:L/AC:M/Au:N/C:P/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-8616
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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-8616
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 0.8726
EPSS Score 0.03552
Published At Aug. 15, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:16.335251+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.17/main.json 37.0.0