CVE-2015-20111

Process-memory disclosure via unchecked snprintf lengths

Published Nov 18, 2024 · Updated Nov 18, 2024

Buffer overflow in miniupnpc in Bitcoin Core before 0.12 allows remote attackers to disclose process memory through UPnP. MiniUPnPc trusts snprintf return lengths after fixed buffers truncate output, so later pointer or send operations proceed beyond those buffers. Reachability requires UPnP at startup and a malicious server on the local network; code execution additionally requires a second stack overflow.

CVSS severity9.8
Critical
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in miniupnpc in Bitcoin Core before 0.12 allows remote attackers to disclose process memory through UPnP. MiniUPnPc trusts snprintf return lengths after fixed buffers truncate output, so later pointer or send operations proceed beyond those buffers. Reachability requires UPnP at startup and a malicious server on the local network; code execution additionally requires a second stack overflow.

The record

CVE
CVE-2015-20111
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
Bitcoin
Product
Bitcoin Core
Classifications
CWE-120, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Bitcoin · Bitcoin Coreversion=0 <0.12

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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