Security readout for executives and security teams
Plain-English summary
Geth nodes running versions before 1.9.18 can crash while processing blocks. The direct business risk is service disruption for systems that depend on those Ethereum nodes, not data theft or transaction modification according to the provided CVSS impact.
Executive priority
Treat this as a moderate availability risk. It should be scheduled promptly where Geth supports production, trading, custody, monitoring, or customer-facing blockchain functions. It is less urgent for isolated non-production nodes.
Technical view
CVE-2020-26242 affects go-ethereum before 1.9.18. The vulnerability is a denial-of-service crash during block processing. CVSS 3.1 is 6.5: network attack vector, low complexity, privileges required, no user interaction, and high availability impact only.
Likely exposure
Exposure is limited to environments running ethereum go-ethereum, also known as Geth, below version 1.9.18. Public or business-critical nodes carry higher operational risk because a crash can interrupt dependent blockchain services.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation is network-reachable with low complexity but requires privileges. Sources do not provide enough detail to confirm exploit prevalence.
Researcher notes
The evidence identifies the vulnerable product, version boundary, impact class, and fixed release, but not root-cause details or active exploitation. Avoid assuming broader Ethereum client impact beyond go-ethereum versions before 1.9.18.
Mitigation direction
- Upgrade go-ethereum Geth to version 1.9.18 or later.
- Prioritize externally reachable and business-critical Ethereum nodes first.
- Check the GitHub advisory and Ethereum blog for vendor operational guidance.
- Monitor affected nodes for crash loops and unexpected block-processing failures.
Validation and detection
- Inventory all Geth nodes and record exact go-ethereum versions.
- Flag any go-ethereum version older than 1.9.18.
- Confirm upgraded nodes report version 1.9.18 or later.
- Review node availability logs for unexplained crashes during block processing.
- Map dependent services that would fail if a Geth node crashes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CVE-2020-26242 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ethereum/go-ethereum/security/advisories/GHSA-jm5c-rv3w-w83mCVE reference · x_refsource_CONFIRM
- https://blog.ethereum.org/2020/11/12/geth_security_release/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.