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CVE Record

CVE-2020-23259: An issue found in Jsish v.3.0.11 and before allows an attacker to cause a denial of service via the Jsi_Str...

An issue found in Jsish v.3.0.11 and before allows an attacker to cause a denial of service via the Jsi_Strlen function in the src/jsiChar.c file.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2020-23259 is a denial-of-service issue in Jsish v3.0.11 and earlier. A vulnerable Jsi_Strlen path can crash or stop service availability. The business concern is outage risk, not data theft, based on the supplied CVSS and CWE data.

Executive priority

Treat as a high-priority availability risk for any business service that embeds exposed Jsish. Prioritize discovery first because public affected-product metadata is incomplete.

Technical view

The CVE maps to CWE-476 and affects the Jsi_Strlen function in src/jsiChar.c. CVSS 3.1 is 7.5: network-accessible, low complexity, no privileges, no user interaction, availability impact high, with no confidentiality or integrity impact stated.

Likely exposure

Exposure is most likely where Jsish v3.0.11 or earlier is embedded or deployed in software that processes untrusted input. The provided affected CPE metadata is incomplete, so asset discovery must confirm actual Jsish use.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates potentially unauthenticated network-triggered denial of service, but the practical path depends on how Jsish is exposed in a product or service.

Researcher notes

The strongest evidence is the CVE description, CVSS vector, CWE-476 classification, and two project references. The bundle does not provide detailed exploit conditions, fixed version, or broad product mapping, so avoid extrapolating beyond Jsish v3.0.11 and earlier.

Mitigation direction

  • Inventory systems and applications using Jsish.
  • Identify any Jsish versions at or before v3.0.11.
  • Check Jsish project guidance for a fixed release or official patch.
  • Reduce untrusted access to services embedding vulnerable Jsish.
  • Add monitoring for crashes, restarts, and availability drops.

Validation and detection

  • Confirm Jsish version information from deployed binaries or package metadata.
  • Review whether exposed services pass untrusted input into Jsish.
  • Check project issue and Fossil ticket for vendor remediation status.
  • Verify availability monitoring covers affected services.
  • Document any compensating controls for unfixed deployments.
Prepared
Confidence
medium
Sources
4

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.

cwe · low confidence lookup

CWE-476: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2020-23259 mapping review

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

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
3Source 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2020-23259Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
n/an/an/aListed
Weakness

CWE details

CWE-476

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

CWE-476 · source CWE mapping

NULL Pointer Dereference

NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs