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CVE-2019-6250· NVD / CVE Program· CNA mitre

A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x and 4.3.x before 4.3.1.

A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x and 4.3.x before 4.3.1. A v2_decoder.cpp zmq::v2_decoder_t::size_ready integer overflow allows an authenticated attacker to overwrite an arbitrary amount of bytes beyond the bounds of a buffer, which can be leveraged to run arbitrary code on the target system. The memory layout allows the attacker to inject OS commands into a data structure located immediately after the problematic buffer (i.e., it is not necessary to use a typical buffer-overflow exploitation technique that changes the flow of control).

HighCVSS 8.8 · v3.0—Proof of concept Fix available
Published
Jan 13, 2019
Updated
Jun 16, 2026
EPSS
9.7% · 95th percentile
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Action score

38

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 9.7%

Affected systems

VendorProduct
zeromqlibzmq
debiandebian linux

Affected versions

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

  • debian debian linux9.0
  • zeromq libzmq4.2.0 and later · up to 4.2.5 inclusive
  • zeromq libzmq4.3.0 and later · before 4.3.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10zeromqbefore 4.3.1-r04.3.1-r0
Alpine:v3.6zeromqbefore 4.2.5-r04.2.5-r0
Debian:12zeromq3before 4.3.1-14.3.1-1
Debian:9zeromq3before 4.2.1-4+deb9u14.2.1-4+deb9u1
openSUSE:Tumbleweedpython-pyzmqbefore 27.1.0-3.127.1.0-3.1
openSUSE:Tumbleweedzeromqbefore 4.3.4-2.24.3.4-2.2
SUSE:Linux Enterprise Module for Basesystem 15zeromqbefore 4.2.3-3.3.24.2.3-3.3.2

Same product

zeromq: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-13132In ZeroMQ libzmq before 4.0.9, 4.1.x before 4.1.7, and 4.2.x before 4.3.2, a remote, unauthenticated client connecting to a libzmq applicati
    51Plan
  • CVE-2021-20235There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp.
    45Plan
  • CVE-2020-36400ZeroMQ libzmq 4.3.3 has a heap-based buffer overflow in zmq::tcp_read, a different vulnerability than CVE-2021-20235.
    40Plan
  • CVE-2021-20237An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3.
    31Monitor
  • CVE-2020-15166Denial of Service in ZeroMQ
    31Monitor
  • CVE-2021-20234An uncontrolled resource consumption (memory leak) flaw was found in the ZeroMQ client in versions before 4.3.3 in src/pipe.cpp.
    26Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
alpine:zeromq4.3.1-r0 · Alpine:v3.10Package registry (OSV)
debian:zeromq34.3.1-1 · Debian:12Package registry (OSV)
opensuse:python-pyzmq27.1.0-3.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:zeromq4.3.4-2.2 · openSUSE:TumbleweedPackage registry (OSV)
suse:zeromq4.2.3-3.3.2 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:12024-06-20
Proof-of-concept repository on GitHubstars:02026-05-03

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.

  1. Published
  2. First PoC+1985 d
  3. TodaySep 30, 2026+2817 d
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.
  • A low-privileged account is enough.
  • 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
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-primary

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

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Change log

  1. Fix✗ → ✓

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References

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

All records