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CVE-2016-8622

LOW
Published 2018-07-31T21:00:00
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Expert Analysis

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CVSS Score

V3.0
3.7
/10
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.016
probability
of exploitation in the wild

There is a 1.6% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.806
Higher than 80.6% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
LOW
Availability
NONE

Description

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

The Curl Project

curl

Affected Versions:

7.51.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed CRITICAL

GHSA-xfmx-53v5-938g

Advisory Details

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.

CVSS Scoring

CVSS Score

9.0

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2016-8622
WEB https://access.redhat.com/errata/RHSA-2018:2486
WEB https://access.redhat.com/errata/RHSA-2018:3558
WEB https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622
WEB https://curl.haxx.se/docs/adv_20161102H.html
WEB https://security.gentoo.org/glsa/201701-47
WEB https://www.tenable.com/security/tns-2016-21
WEB http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
WEB http://www.securityfocus.com/bid/94105
WEB http://www.securitytracker.com/id/1037192

Advisory provided by GitHub Security Advisory Database. Published: May 14, 2022, Modified: May 14, 2022

References

https://access.redhat.com/errata/RHSA-2018:3558
https://curl.haxx.se/docs/adv_20161102H.html
https://www.tenable.com/security/tns-2016-21
http://www.securitytracker.com/id/1037192
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/94105
https://access.redhat.com/errata/RHSA-2018:2486
https://security.gentoo.org/glsa/201701-47
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622
Published: 2018-07-31T21:00:00
Last Modified: 2024-08-06T02:27:40.993Z
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