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CVE Record

CVE-2020-13355: An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.14.

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.14. A path traversal is found in LFS Upload that allows attacker to overwrite certain specific paths on the server. Affected versions are: >=8.14, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This GitLab CE/EE flaw could let a logged-in attacker abuse Git LFS upload handling to overwrite certain server paths. That can threaten code hosting integrity and availability, especially for organizations running old GitLab versions.

Executive priority

Treat as a high-priority legacy GitLab upgrade issue. It is not KEV-listed in the provided evidence, but successful exploitation could damage repository hosting trust and service continuity.

Technical view

CVE-2020-13355 is a path traversal issue in GitLab CE/EE LFS Upload. The CVSS vector is network-accessible, low privileges required, high attack complexity, no user interaction, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely in GitLab CE/EE deployments running versions >=8.14 before 13.3.9, 13.4 before 13.4.5, or 13.5 before 13.5.2.

Exploitation context

The provided bundle does not show CISA KEV listing or active exploitation evidence. Public issue and HackerOne references indicate disclosure details exist, but this analysis should not assume exploitation in the wild.

Researcher notes

Do not broaden scope beyond GitLab CE/EE. The source bundle lists no CWE and no active exploitation. Affected ranges imply fixed releases at 13.3.9, 13.4.5, and 13.5.2 or later supported versions.

Mitigation direction

  • Upgrade GitLab CE/EE to a version outside the affected ranges.
  • Prioritize internet-facing or broadly accessible GitLab instances first.
  • Check GitLab vendor guidance for any temporary controls if upgrade is delayed.
  • Review change management records for legacy GitLab versions still in service.

Validation and detection

  • Inventory GitLab CE/EE versions across production, staging, and backup systems.
  • Confirm no instance remains in the affected version ranges.
  • Verify whether Git LFS upload functionality is exposed to authenticated users.
  • Review server file integrity and unusual upload activity where affected versions were present.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-13355 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H1.65.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2020-13355Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GitLabGitLab CE/EE>=8.14, <13.3.9, >=13.4, <13.4.5, >=13.5, <13.5.2Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.