CVE-2025-67873 | Capstone doesn't check Skipdata length, leading to cs_insn.bytes heap buffer overflow

Exp

Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, Skipdata length is not bounds-checked, so a user-provided skipdata callback can make cs_disasm/cs_disasm_iter memcpy more than 24 bytes into cs_insn.bytes, causing a heap buffer overflow in the disassembly path. Commit cbef767ab33b82166d263895f24084b75b316df3 fixes the issue.

Published: 2025-12-17 Last update: 2026-01-02 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-67873 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-67873

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

Exploit prediction scoring system (EPSS) score for CVE-2025-67873

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-18 — 0.01% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-67873

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.8 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L 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: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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.3 3.4 [email protected]
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]

Weakness enumeration for CVE-2025-67873

OS Trackers for CVE-2025-67873

vendor priority summary link
alpine — CVE-2025-67873: 1 source package rows (capstone); 10 state rows across 3 repos (3.22-community, 3.23-community, edge-community); fixed 3, open 7. https://security.alpinelinux.org/vuln/CVE-2025-67873
debian not yet assigned CVE-2025-67873 not yet assigned priority: Debian including 1 source packages (capstone), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2025-67873
redhat medium — https://access.redhat.com/security/cve/CVE-2025-67873
suse medium CVE-2025-67873 severity moderate: SUSE including 13 source package names (capstone-4.0.2-11.el9_7, capstone-4.0.2-150500.3.3.1, …), 36 product×package rows across 20 product lines (Image SL-Micro, Image SL-Micro-Default, … (20 product lines)): Fixed 36. https://www.suse.com/security/cve/CVE-2025-67873/
ubuntu medium CVE-2025-67873 medium priority: Ubuntu including 1 source packages (capstone), 8 status rows across 8 suites (bionic, focal, jammy, noble, plucky, questing, upstream, xenial): needs-triage 7, ignored 1. https://ubuntu.com/security/CVE-2025-67873

Affected software / configurations for CVE-2025-67873

Vendor Product Version Raw CPE
capstone-engine capstone < 6.0.0 cpe:2.3:a:capstone-engine:capstone:*:*:*:*:*:*:*:*
capstone-engine capstone 6.0.0 cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha1:*:*:*:*:*:*
capstone-engine capstone 6.0.0 cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha2:*:*:*:*:*:*
capstone-engine capstone 6.0.0 cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha3:*:*:*:*:*:*
capstone-engine capstone 6.0.0 cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha4:*:*:*:*:*:*
capstone-engine capstone 6.0.0 cpe:2.3:a:capstone-engine:capstone:6.0.0:alpha5:*:*:*:*:*:*

References for CVE-2025-67873

cvelogic Threat Intelligence