CVE-2021-20235

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2021-20235
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20235.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-20235
Aliases
  • GHSA-fc3w-qxf5-7hp6
Downstream
Published
2021-04-01T14:15:13Z
Modified
2026-10-24T10:50:40Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.

Database specific 
{
    "unresolved_ranges":  [
        {
            "cpes":  [
                "cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:*"
            ],
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "4.2.0"
                        },
                        {
                            "fixed":  "4.3.3"
                        },
                        {
                            "introduced":  "4.2.0"
                        },
                        {
                            "fixed":  "4.3.3"
                        }
                    ],
                    "source":  "CPE_RANGE"
                }
            ],
            "vendor_product":  "zeromq:libzmq"
        }
    ]
}
References

Affected packages

Git / github.com/zeromq/libzmq

Affected ranges

Type
GIT
Repo
https://github.com/zeromq/libzmq
Events
Introduced
097bf26e8dacf73abc2a6cdd6f9e4dce824b8208
Fixed
04f5bbedee58c538934374dc45182d8fc5926fa3
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "4.2.0"
                },
                {
                    "fixed":  "4.3.3"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

v4.*
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.3.0
v4.3.1
v4.3.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20235.json"