CVE-2017-8818 [Critical] | Memory Corruption in Curl

CVE-2017-8818 is rated High Risk (73.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.00%). EPSS rose +3.17% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.83%	4.00%	+3.17%
2	2026-05-26	0.73%	0.83%	+0.10%
3	2026-04-11	—	0.73%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.83%

4.00%

+3.17%

2026-05-26

0.73%

0.83%

+0.10%

2026-04-11

—

0.73%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.0

CRITICAL

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2017-8818

vendor	priority	summary	link
`alpine`	—	CVE-2017-8818: 1 source package rows (curl); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0.	https://security.alpinelinux.org/vuln/CVE-2017-8818
`debian`	not yet assigned	CVE-2017-8818 not yet assigned priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2017-8818
`gentoo`	normal	CVE-2017-8818: 1 GLSA(s) (201712-04), 1 atom(s) (net-misc/curl); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-8818
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2017-8818
`ubuntu`	medium	CVE-2017-8818 medium priority: Ubuntu including 1 source packages (curl), 5 status rows across 5 suites (artful, trusty, upstream, xenial, zesty): not-affected 4, released 1.	https://ubuntu.com/security/CVE-2017-8818

Affected software / configurations for CVE-2017-8818

Vendor	Product	Version	Raw CPE
haxx	curl	7.56.0	cpe:2.3:a:haxx:curl:7.56.0:::::::*
haxx	curl	7.56.1	cpe:2.3:a:haxx:curl:7.56.1:::::::*
haxx	libcurl	7.56.0	cpe:2.3:a:haxx:libcurl:7.56.0:::::::*
haxx	libcurl	7.56.1	cpe:2.3:a:haxx:libcurl:7.56.1:::::::*

References for CVE-2017-8818

URL	Tags
http://security.cucumberlinux.com/security/details.php?id=163	Third Party Advisory
http://www.securityfocus.com/bid/102014	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039898	Third Party Advisory VDB Entry
https://curl.haxx.se/docs/adv_2017-af0a.html	Patch Vendor Advisory
https://security.gentoo.org/glsa/201712-04	Third Party Advisory

URL

CVE-2017-8818

Exploit prediction scoring system (EPSS) score for CVE-2017-8818

Common vulnerability scoring system (CVSS) metrics for CVE-2017-8818

Weakness enumeration for CVE-2017-8818

OS Trackers for CVE-2017-8818

Affected software / configurations for CVE-2017-8818

References for CVE-2017-8818