CVE-2020-15890 [High] | Out-of-bounds Read in Luajit

CVE-2020-15890 is rated High Exploit Risk (76.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.86%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.11% 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	0.75%	2.86%	+2.11%
2	2026-05-29	0.96%	0.75%	-0.21%
3	2026-05-28	—	0.96%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.75%

2.86%

+2.11%

2026-05-29

0.96%

0.75%

-0.21%

2026-05-28

—

0.96%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2020-15890

vendor	priority	summary	link
`alpine`	—	CVE-2020-15890: 1 source package rows (luajit); 1 state rows across 1 repos (edge-main); fixed 1, open 0.	https://security.alpinelinux.org/vuln/CVE-2020-15890
`debian`	unimportant	CVE-2020-15890 unimportant priority: Debian including 1 source packages (luajit), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-15890
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-15890
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2020-15890/
`ubuntu`	low	CVE-2020-15890 low priority: Ubuntu including 1 source packages (luajit), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 6, ignored 4, needed 4, released 2.	https://ubuntu.com/security/CVE-2020-15890

Affected software / configurations for CVE-2020-15890

Vendor	Product	Version	Raw CPE
luajit	luajit	<= 2.0.5	cpe:2.3:a:luajit:luajit::::::::
luajit	luajit	2.1.0	cpe:2.3:a:luajit:luajit:2.1.0:beta1::::::
luajit	luajit	2.1.0	cpe:2.3:a:luajit:luajit:2.1.0:beta2::::::
luajit	luajit	2.1.0	cpe:2.3:a:luajit:luajit:2.1.0:beta3::::::
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::esm:::

References for CVE-2020-15890

URL	Tags
https://github.com/LuaJIT/LuaJIT/issues/601	Exploit Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00026.html	Mailing List Third Party Advisory
https://usn.ubuntu.com/4501-1/	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/08/msg00022.html

URL

CVE-2020-15890

Public exploit references (Exploit-DB) for CVE-2020-15890

Exploit prediction scoring system (EPSS) score for CVE-2020-15890

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15890

Weakness enumeration for CVE-2020-15890

OS Trackers for CVE-2020-15890

Affected software / configurations for CVE-2020-15890

References for CVE-2020-15890