CVE-2021-28965

7.5 HIGH 5% exploit odds Fix listed Other

What it is

The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and serializing.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
Exploit odds: 5.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-04-21 07:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:47 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 5.1% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-04-21 07:15 UTC
Last modified: 2026-06-17 03:47 UTC
Exploit probability: 5.1% · EPSS, next 30 days
Record status: Modified

Affected

ruby-lang Rexml < 3.2.5
ruby-lang Ruby < 2.6.7
ruby-lang Ruby < 2.7.3
ruby-lang Ruby < 3.0.1
Fedoraproject Fedora 34

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-28965.md and follow it. Check whether this project is affected by CVE-2021-28965. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record