Buffer overflow in Mikrotik Routeros
CVE-2026-7668
A vulnerability was identified in MikroTik RouterOS 6.49.8. This vulnerability affects the function ASN1_STRING_data in the library nova/lib/www/scep.p of the component SCEP Endpoint. The manipulation of the argument transactionID/messageType leads to out-of-bounds read. The attack may be initiated remotely. The exploit is publicly available and might be used. You should upgrade the affected component. The vendor recommends to "use the latest v6.x or 7.x MikroTik RouterOS version, the reported issue should be fixed there."
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Mikrotik Routeros — versions 6.49.8
Weakness classification (CWE)
References
- vuldb.com/vuln/360804 (technical-description, vdb-entry)
- vuldb.com/vuln/360804/cti (signature, permissions-required)
- vuldb.com/submit/798623 (third-party-advisory)
- github.com/ezio315/cve/issues/4 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-7668?
- CVE-2026-7668 is a high-severity vulnerability in Mikrotik Routeros, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-05-02.
- How severe is CVE-2026-7668?
- High severity. CVSS v3 base score is 7.3 out of 10.