CVE-2023-34411Public exploitNetwork attack vector

Application crash via unreachable token formatter

Published Jun 5, 2023 · Updated Jan 8, 2025

Denial of service in xml-rs 0.8.9 through 0.8.13 allows remote attackers to crash applications via malformed XML input. The Token Display implementation routes an unexpected MarkupDeclarationStart token to unreachable!() while formatting a parser error, causing a panic instead of returning an error. Exploitation requires an application using the crate to parse attacker-controlled XML; the panic interrupts that application without reported data exposure or modification.

CVSS severity7.5
High
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in xml-rs 0.8.9 through 0.8.13 allows remote attackers to crash applications via malformed XML input. The Token Display implementation routes an unexpected MarkupDeclarationStart token to unreachable!() while formatting a parser error, causing a panic instead of returning an error. Exploitation requires an application using the crate to parse attacker-controlled XML; the panic interrupts that application without reported data exposure or modification.

The record

CVE
CVE-2023-34411
Published
Jun 5, 2023
Updated
Jan 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, CWE-611, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
CWE-611Improper Restriction of XML External Entity Reference
T1499.004Application or System Exploitation

Public exploit references

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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