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CVE Record

CVE-2021-28091: Lasso all versions prior to 2.7.0 has improper verification of a cryptographic signature.

Lasso all versions prior to 2.7.0 has improper verification of a cryptographic signature.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-28091 is a cryptographic signature verification flaw in Lasso before 2.7.0. The sources do not provide CVSS, impact detail, or confirmed exploitation. Because signature checks often protect trust decisions, exposed systems should be identified and upgraded using vendor or distribution guidance.

Executive priority

Prioritize remediation for systems where Lasso supports authentication, identity, or other trust-sensitive workflows. Severity is not quantified in the sources, but signature verification failures can undermine security boundaries.

Technical view

The CVE record states that Lasso versions before 2.7.0 improperly verify a cryptographic signature. Debian and Fedora issued security updates, and upstream references include a 2.7.0 NEWS entry and commit. The bundle does not specify attack prerequisites, affected integrations, CWE, CVSS, or exploitability details.

Likely exposure

Exposure is likely limited to applications or operating system packages that include Lasso before 2.7.0. Debian and Fedora advisories indicate packaged Linux distributions were affected, but the bundle does not enumerate exact package versions beyond the upstream threshold.

Exploitation context

No active exploitation is stated in the provided sources, and the CVE is not marked in KEV. The available evidence supports a patch-management concern, not a confirmed exploited-in-the-wild incident.

Researcher notes

Evidence is sparse: no CVSS, CWE, proof-of-concept status, or attack path is included. Focus analysis on the upstream commit, 2.7.0 release notes, and distro patches to understand the verification flaw and affected package lineage.

Mitigation direction

  • Upgrade Lasso to 2.7.0 or a fixed distribution package.
  • Apply Debian DSA-4926 updates where applicable.
  • Apply the relevant Debian LTS DLA 2684-1 update where applicable.
  • Apply Fedora package updates listed in the Fedora advisories.
  • Check upstream or distribution guidance for environment-specific remediation details.

Validation and detection

  • Inventory hosts and applications for installed Lasso packages or bundled libraries.
  • Confirm installed Lasso versions are 2.7.0 or vendor-fixed builds.
  • Review Debian and Fedora package advisory applicability for managed systems.
  • Check dependency manifests and container images for older Lasso copies.
  • Document any unsupported systems requiring compensating risk treatment.
Prepared
Confidence
medium
Sources
8

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.

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CVE-2021-28091 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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