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CVE-2015-5684· NVD / CVE Program· CNA mitre

MITRE is populating this ID because it was assigned prior to Lenovo becoming a CNA.

MITRE is populating this ID because it was assigned prior to Lenovo becoming a CNA. A buffer overflow vulnerability was reported, (fixed and publicly disclosed in 2015) in the Lenovo Service Engine (LSE), affecting various versions of BIOS for Lenovo Notebooks, that could allow a remote user to execute arbitrary code on the system.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded
Published
Mar 27, 2020
Updated
Jun 16, 2026
EPSS
3.7% · 89th percentile
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Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.7%

Affected systems

VendorProduct
lenovob50-10 firmware
lenovob50-10
lenovoflex 2 pro-15 firmware
lenovoflex 2 pro-15
lenovoedge 15 firmware
lenovoedge 15
lenovoflex 3-1470 firmware
lenovoflex 3-1470
lenovoflex 3-1570 firmware
lenovoflex 3-1570
lenovoflex 3-1120 firmware
lenovoflex 3-1120

and 42 more

Affected versions

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

  • lenovo b50-10 firmwarebefore cccn13ww\(v1.02\)
  • lenovo edge 15 firmwarebefore a9cn46ww
  • lenovo edge 15 firmwarebefore b9cn17ww
  • lenovo flex 2 pro-15 firmwarebefore a9cn46ww
  • lenovo flex 2 pro-15 firmwarebefore b9cn17ww
  • lenovo flex 3-1120 firmwarebefore c0cn25ww
  • lenovo flex 3-1470 firmwarebefore bdcn30ww
  • lenovo flex 3-1570 firmwarebefore bdcn30ww
  • lenovo g40-80 firmwarebefore b0cn75ww
  • lenovo g40-80m firmwarebefore cbcn75ww
  • lenovo g50-80 firmwarebefore b0cn75ww
  • lenovo g50-80 touch firmwarebefore b0cn75ww
  • lenovo g50-80 touch v3000 firmwarebefore b0cn75ww
  • lenovo g50-80m firmwarebefore cbcn75ww
  • lenovo g70-80 firmwarebefore abcn75ww
  • lenovo ideapad 100-14iby firmwarebefore v1.02_\(cccn13ww\)
  • lenovo ideapad 100-15iby firmwarebefore v1.02_\(cccn13ww\)
  • lenovo m40-35 firmwarebefore bbcn15ww\(v1.06\)
  • lenovo s21e firmwarebefore c4cn14ww\(v1.04\)
  • lenovo s41-70 firmwarebefore bdcn30ww

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

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

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

Attack context

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

ATT&CK techniques

—

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.

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