CVE-2015-8370
Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive…
- 7.4HighCVSS base score
- 1.1%Exploitation in 30 daysEPSS · top 34% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By mitre
- 19 days later
· 19 days later
Published
- 9 years later
· 9 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.4 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.4 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.1% · top 34% of all CVEs (9 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
n/a
- affected n/a
References
23
- http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html (opens in a new tab)x_transferred
- openSUSE-SU-2015:2392 (opens in a new tab)vendor-advisoryx_transferred
- openSUSE-SU-2016:0036 (opens in a new tab)vendor-advisoryx_transferred
- http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html (opens in a new tab)x_transferred
- 79358 (opens in a new tab)vdb-entryx_transferred
- openSUSE-SU-2015:2375 (opens in a new tab)vendor-advisoryx_transferred
- 1034422 (opens in a new tab)vdb-entryx_transferred
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html (opens in a new tab)x_transferred
- SUSE-SU-2015:2387 (opens in a new tab)vendor-advisoryx_transferred
- SUSE-SU-2015:2386 (opens in a new tab)vendor-advisoryx_transferred
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html (opens in a new tab)x_transferred
- [oss-security] 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370] (opens in a new tab)mailing-listx_transferred
- 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370] (opens in a new tab)mailing-listx_transferred
- SUSE-SU-2015:2385 (opens in a new tab)vendor-advisoryx_transferred
- 20151216 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370] (opens in a new tab)mailing-listx_transferred
- GLSA-201512-03 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2015-cebe5133e7 (opens in a new tab)vendor-advisoryx_transferred
- USN-2836-1 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2015-90c27b6e91 (opens in a new tab)vendor-advisoryx_transferred
- RHSA-2015:2623 (opens in a new tab)vendor-advisoryx_transferred
- SUSE-SU-2015:2399 (opens in a new tab)vendor-advisoryx_transferred
- DSA-3421 (opens in a new tab)vendor-advisoryx_transferred
- [oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager (opens in a new tab)mailing-listx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2015-8254 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2015-8370)Record last updated .