CVE-2016-8623: haxx curl Use After Free
CVSS: 7.5v3.0HighModified
AliasesALPINE-CVE-2016-8623UBUNTU-CVE-2016-8623DEBIAN-CVE-2016-8623
Published 01-08-2018Last modified 16-04-2026
Vulnerability summary
CVE-2016-8623 is a high (CVSS 7.5) Use After Free vulnerability in haxx curl. EPSS estimates a 2.55% chance of exploitation in the next 30 days, higher than 84.7% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.0 (NVD)EPSS score
2.55%
0%100%
Low · -0.20 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 9 · Related 5Timeline
- 01-08-2018PublishedVulnerability first disclosed.
- 16-04-2026Last modifiedVulnerability information updated.
Description
A flaw was found in curl before version 7.51.0. The way curl handles cookies permits other threads to trigger a use-after-free leading to information disclosure.
CVSS metrics
6 scores · 5 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSources5 sources · 3.3–7.5
- CVE.orgCNA3.3LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NDiffers
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated3.3LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NDiffers
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
2.55%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
-0.20 pp
From 2.75% on 18-09-2026
18-09-202618-10-2026
EPSS score2.55%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- curl< 7.51.0-r0 | < 7.51.0 | < 7.49.1-r4
Debian1 product
- curl< 7.51.0-1
Haxx1 product
- curl< 7.51.0
The curl project1 product
- curl7.51.0
Ubuntu1 product
- curl< 7.35.0-1ubuntu2.10 | < 7.47.0-1ubuntu2.2
5 vendors · 5 products
References
17 links- bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8623X Refsource CONFIRMIssue TrackingPatchThird Party Advisory
