CVE-2018-25018 [High] | Out-of-bounds Write in Unrar

CVE-2018-25018 is rated High Exploit Risk (70.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.31%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

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Published

Link

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Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.41%	1.31%	+0.90%
2	2025-03-30	0.49%	0.41%	-0.08%
3	2025-03-29	—	0.49%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.41%

1.31%

+0.90%

2025-03-30

0.49%

0.41%

-0.08%

2025-03-29

—

0.49%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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]
6.8	2.0	MEDIUM	`AV:N/AC:M/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:M) Exploitation needs some favorable conditions, but not exceptional ones. 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.	8.6	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:N/UI:R/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:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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]

6.8

2.0

MEDIUM

AV:N/AC:M/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:M): Exploitation needs some favorable conditions, but not exceptional ones.
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.

8.6

6.4

[email protected]

OS Trackers for CVE-2018-25018

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2018-25018 not yet assigned priority: Debian including 1 source packages (unrar-nonfree), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2018-25018
`suse`	medium	CVE-2018-25018 severity moderate: SUSE including 1 source package names (unrar), 21 product×package rows across 21 product lines (HPE Helion OpenStack 8, SUSE Linux Enterprise High Performance Computing 12 SP5, … (21 product lines)): Known Not Affected 21.	https://www.suse.com/security/cve/CVE-2018-25018/
`ubuntu`	medium	CVE-2018-25018 medium priority: Ubuntu including 1 source packages (unrar-nonfree), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 6, not-affected 6, needs-triage 3, DNE 1.	https://ubuntu.com/security/CVE-2018-25018

Affected software / configurations for CVE-2018-25018

Vendor	Product	Version	Raw CPE
rarlab	unrar	>= 5.6.1.7, <= 5.7.4	cpe:2.3:a:rarlab:unrar::::::::
rarlab	unrar	6.0.3	cpe:2.3:a:rarlab:unrar:6.0.3:::::::*

References for CVE-2018-25018

URL	Tags
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9845	Exploit Issue Tracking Patch Third Party Advisory
https://github.com/aawc/unrar/releases	Release Notes Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/unrar/OSV-2018-204.yaml	Third Party Advisory

URL

CVE-2018-25018

Public exploit references (Exploit-DB) for CVE-2018-25018

Exploit prediction scoring system (EPSS) score for CVE-2018-25018

Common vulnerability scoring system (CVSS) metrics for CVE-2018-25018

Weakness enumeration for CVE-2018-25018

OS Trackers for CVE-2018-25018

Affected software / configurations for CVE-2018-25018

References for CVE-2018-25018