Is CVE-2020-27507 in the CISA KEV catalog?

No. CVE-2020-27507 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27507?

CVE-2020-27507 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2020-27507?

CVE-2020-27507 has an EPSS score of 1.18% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27507?

Upgrade kamailio on debian 11 to 5.4.2-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27507

CRITICAL

9.8

CVSS v3

NVD

Description

The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

CWE-120Classic Buffer Overflow

How to fix

Remediation Available

kamailioDebian

Fixed in:5.4.2-1CVE-2020-27507

kamailioUbuntu

Fixed in:4.3.4-1.1ubuntu2.1+esm1USN-6022-1

Fixed in:5.1.2-1ubuntu2+esm1USN-6022-1

Fixed in:5.3.2-1ubuntu0.1~esm1USN-6022-1

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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.18%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-120 (Classic Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0195	Medium	6.8	100%	-	Fix
CVE-2017-7269	Critical	9.8	100%	KEV	-
CVE-2019-11043	High	8.7	99%	KEV + Ransom	Fix
CVE-2011-4862	High	10.0	95%	-	Fix
CVE-2007-5659	High	7.8	94%	KEV	Fix
CVE-2022-3786	High	7.5	91%	-	Fix

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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 2025-02-27.