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CVE-2017-3775· NVD / CVE Program· CNA lenovo

Some Lenovo System x server BIOS/UEFI versions, when Secure Boot mode is enabled by a system administrator, do not properly authenticate sig

Some Lenovo System x server BIOS/UEFI versions, when Secure Boot mode is enabled by a system administrator, do not properly authenticate signed code before booting it. As a result, an attacker with physical access to the system could boot unsigned code.

MediumCVSS 6.4 · v3.0—No exploit No fix recorded
Published
May 4, 2018
Updated
Jun 16, 2026
EPSS
0.3% · 17th percentile
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Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

Affected systems

VendorProduct
lenovoflex system x240 m5 bios
lenovoflex system x240 m5
lenovoflex system x280 x6 bios
lenovoflex system x280 x6
lenovoflex system x480 x6 bios
lenovoflex system x480 x6
lenovoflex system x880 bios
lenovoflex system x880
lenovonextscale nx360 m5 bios
lenovonextscale nx360 m5
lenovosystem x3250 m6 bios
lenovosystem x3250 m6

and 10 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • lenovo flex system x240 m5 biosbefore 2.61
  • lenovo flex system x280 x6 biosbefore 4.21
  • lenovo flex system x480 x6 biosbefore 4.21
  • lenovo flex system x880 biosbefore 4.21
  • lenovo nextscale nx360 m5 biosbefore 2.61
  • lenovo system x3250 m6 biosbefore 2.23
  • lenovo system x3500 m5 biosbefore 2.61
  • lenovo system x3550 m5 biosbefore 2.61
  • lenovo system x3650 m5 biosbefore 2.61
  • lenovo system x3850 x6 biosbefore 4.3
  • lenovo system x3950 x6 biosbefore 4.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (lenovo). Independent of NVD's CPE analysis and usually ahead of it.

  • Lenovo Group Ltd. Some Lenovo Flex System and Lenovo System x products

    • Affected BIOS version varies by productaffected

Same product

lenovo: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-8226The BIOS in Lenovo System X M5, M6, and X6 systems allows administrators to cause a denial of service via updating a UEFI data structure.
    19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Physical access to the device is required.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Physical
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records