Vulnerability-Lookup

UBUNTU-CVE-2020-29511 (CVE-2020-29511)

Vulnerability from osv_ubuntu – Published: 2020-12-14 20:15 – Updated: 2025-10-24 04:48 – Source website

Details

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.

Severity

9.8 (Critical)


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

5.6 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-29511	REPORT
	https://mattermost.com/blog/coordinated-disclosur…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-29511	REPORT

JSON

To clipboard

{
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          {
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            "binary_version": "1.10.4-2ubuntu1~14.04.1"
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  ],
  "aliases": [],
  "details": "The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.",
  "id": "UBUNTU-CVE-2020-29511",
  "modified": "2025-10-24T04:48:56Z",
  "published": "2020-12-14T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-29511"
    },
    {
      "type": "REPORT",
      "url": "https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-29511"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-29511"
  ]
}

CVE-2020-29511 (GCVE-0-2020-29511)

Vulnerability from cvelistv5 – Published: 2020-12-14 19:59 – Updated: 2024-09-17 04:09

Summary

Severity

9.8 (Critical)


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

CWE

CWE-115 - Misinterpretation of Input

Assigner

Mattermost CNA under the mitre root

CNA scorecard B 80/100 over 107 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/mattermost/xml-roundtrip-valid…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021012…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
Golang	Go	Affected: All versions

Date Public

2020-12-14 00:00

Show details on NVD website

JSON

To clipboard

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  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2020-29511",
    "datePublished": "2020-12-14T19:59:50.700Z",
    "dateReserved": "2020-12-03T00:00:00.000Z",
    "dateUpdated": "2024-09-17T04:09:22.123Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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