CVE-2020-8177 [High] | Security Vulnerability in Curl

CVE-2020-8177 is rated High Exploit Risk (70.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.24%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.21% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

EDB-ID

Source

Kind

Published

Link

—

nvd_ref

exploit_tag

Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	1.24%	+1.21%
2	2025-11-21	0.33%	0.02%	-0.31%
3	2025-11-18	—	0.33%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

1.24%

+1.21%

2025-11-21

0.33%

0.02%

-0.31%

2025-11-18

—

0.33%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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.	1.8	5.9	[email protected]
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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.	1.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0
4.6	2.0	MEDIUM	`AV:L/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. 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.	3.9	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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.

1.8

5.9

[email protected]

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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.

1.8

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

4.6

2.0

MEDIUM

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

Access vector (AV:L): Requires local access to the target system.
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.

3.9

6.4

[email protected]

OS Trackers for CVE-2020-8177

vendor	priority	summary	link
`alpine`	—	CVE-2020-8177: 1 source package rows (curl); 115 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 15, open 100.	https://security.alpinelinux.org/vuln/CVE-2020-8177
`debian`	not yet assigned	CVE-2020-8177 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-2020-8177
`gentoo`	normal	CVE-2020-8177: 1 GLSA(s) (202007-16), 1 atom(s) (net-misc/curl); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-8177
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-8177
`suse`	high	CVE-2020-8177 severity important: SUSE including 437 source package names (0.1.0:libcurl4-7.60.0-3.29.1, 0.1.75:libcurl4-7.60.0-3.29.1, …), 692 product×package rows across 228 product lines (Container bci/bci-init, Container bci/dotnet-aspnet, … (228 product lines)): Fixed 535, Known Affected 157.	https://www.suse.com/security/cve/CVE-2020-8177/
`ubuntu`	medium	CVE-2020-8177 medium priority: Ubuntu including 1 source packages (curl), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): released 5, needs-triage 1.	https://ubuntu.com/security/CVE-2020-8177

Affected software / configurations for CVE-2020-8177

Vendor	Product	Version	Raw CPE
haxx	curl	>= 7.20.0, <= 7.70.0	cpe:2.3:a:haxx:curl::::::::
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
fujitsu	m10-1_firmware	< xcp2410	cpe:2.3:o:fujitsu:m10-1_firmware::::::::
fujitsu	m10-4_firmware	< xcp2410	cpe:2.3:o:fujitsu:m10-4_firmware::::::::
fujitsu	m10-4s_firmware	< xcp2410	cpe:2.3:o:fujitsu:m10-4s_firmware::::::::
fujitsu	m12-1_firmware	< xcp2410	cpe:2.3:o:fujitsu:m12-1_firmware::::::::
fujitsu	m12-2_firmware	< xcp2410	cpe:2.3:o:fujitsu:m12-2_firmware::::::::
fujitsu	m12-2s_firmware	< xcp2410	cpe:2.3:o:fujitsu:m12-2s_firmware::::::::
fujitsu	m10-1_firmware	< xcp3110	cpe:2.3:o:fujitsu:m10-1_firmware::::::::
fujitsu	m10-4_firmware	< xcp3110	cpe:2.3:o:fujitsu:m10-4_firmware::::::::
fujitsu	m10-4s_firmware	< xcp3110	cpe:2.3:o:fujitsu:m10-4s_firmware::::::::
fujitsu	m12-1_firmware	< xcp3110	cpe:2.3:o:fujitsu:m12-1_firmware::::::::
fujitsu	m12-2_firmware	< xcp3110	cpe:2.3:o:fujitsu:m12-2_firmware::::::::
fujitsu	m12-2s_firmware	< xcp3110	cpe:2.3:o:fujitsu:m12-2s_firmware::::::::
siemens	sinec_infrastructure_network_services	< 1.0.1.1	cpe:2.3:a:siemens:sinec_infrastructure_network_services::::::::
splunk	universal_forwarder	>= 8.2.0, < 8.2.12	cpe:2.3:a:splunk:universal_forwarder::::::::
splunk	universal_forwarder	>= 9.0.0, < 9.0.6	cpe:2.3:a:splunk:universal_forwarder::::::::
splunk	universal_forwarder	9.1.0	cpe:2.3:a:splunk:universal_forwarder:9.1.0:::::::*

References for CVE-2020-8177

URL	Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf	Patch Third Party Advisory
https://curl.se/docs/CVE-2020-8177.html	Vendor Advisory
https://hackerone.com/reports/887462	Exploit Third Party Advisory
https://www.debian.org/security/2021/dsa-4881	Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html	Patch Third Party Advisory

URL

CVE-2020-8177

Public exploit references (Exploit-DB) for CVE-2020-8177

Exploit prediction scoring system (EPSS) score for CVE-2020-8177

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8177

Weakness enumeration for CVE-2020-8177

OS Trackers for CVE-2020-8177

Affected software / configurations for CVE-2020-8177

References for CVE-2020-8177