Is CVE-2020-5243 in the CISA KEV catalog?

No. CVE-2020-5243 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-5243?

CVE-2020-5243 has a CVSS v3 base score of 5.7 (MEDIUM).

What is the EPSS score for CVE-2020-5243?

CVE-2020-5243 has an EPSS score of 2.21% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-5243?

Upgrade uap-core on debian 11 to 1:0.8.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-5243

MEDIUMEPSS 80th pctl

5.7

CVSS v3

NVD

Description

uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This has been patched in uap-core 0.7.3.

CWE-20Improper Input Validation CWE-1333

How to fix

Remediation Available

uap-coreDebian

Fixed in:1:0.8.0-1CVE-2020-5243

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.21%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.