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Vulnerability details: VCID-rs7d-h1fd-rffh
Vulnerability ID VCID-rs7d-h1fd-rffh
Aliases CVE-2016-8622
Summary The URL percent-encoding decode function in libcurl before 7.51.0 is called `curl_easy_unescape`. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-122 Heap-based Buffer Overflow
CWE-190 Integer Overflow or Wraparound
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8622.json
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
epss 0.01562 https://api.first.org/data/v1/epss?cve=CVE-2016-8622
cvssv3.1 Medium https://curl.se/docs/CVE-2016-8622.html
cvssv2 6.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2016-8622
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2016-8622
archlinux High https://security.archlinux.org/AVG-60
archlinux High https://security.archlinux.org/AVG-62
archlinux High https://security.archlinux.org/AVG-65
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-2016-8622.json
https://api.first.org/data/v1/epss?cve=CVE-2016-8622
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622
https://curl.haxx.se/docs/adv_20161102H.html
https://curl.se/docs/CVE-2016-8622.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/94105
http://www.securitytracker.com/id/1037192
1388386 https://bugzilla.redhat.com/show_bug.cgi?id=1388386
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-62 https://security.archlinux.org/AVG-62
AVG-65 https://security.archlinux.org/AVG-65
cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*
CVE-2016-8622 https://nvd.nist.gov/vuln/detail/CVE-2016-8622
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-2016-8622.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:M/Au:N/C:P/I:P/A:P 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:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2016-8622
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2016-8622
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 0.80727
EPSS Score 0.01562
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:30:06.057039+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.4/main.json 37.0.0