How severe is CVE-2023-34205?

CVE-2023-34205 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-34205 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34205?

CVE-2023-34205 affects Moov Signedxml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34205?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-34205 published?

CVE-2023-34205 was published on 2023-05-30 and last updated on 2026-06-17.

CVE-2023-34205

CVE-2023-34205 is a critical-severity vulnerability in Moov Signedxml with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Moov Signedxml
Published: 2023-05-30
Last modified: 2026-06-17

Description

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Frequently asked questions

What is CVE-2023-34205?: In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).
How severe is CVE-2023-34205?: CVE-2023-34205 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-34205 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34205?: CVE-2023-34205 affects Moov Signedxml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34205?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-34205 published?: CVE-2023-34205 was published on 2023-05-30 and last updated on 2026-06-17.

References

https://github.com/moov-io/signedxml/issues/23

Affected products (1)

cpe:2.3:a:moov:signedxml:1.0.0:*:*:*:*:go:*:*

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