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CVE-2020-36193

91
FAUCET Score

CVE-2020-36193 is a critical directory traversal vulnerability in Archive_Tar's Tar.php component, affecting products like Debian, Drupal, and PHP. This flaw allows unauthenticated attackers to perform arbitrary write operations due to insufficient symbolic link checks. With a CVSS score of 7.5 (HIGH) and an EPSS percentile of 99%, it poses a significant risk, enabling high integrity impact without requiring user interaction. Notably, this vulnerability is listed in CISA's KEV catalog, indicating active exploitation in the wild, despite no public Metasploit or ExploitDB modules. The vulnerability has garnered substantial community discussion and media coverage, highlighting its importance and the urgency for patching.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.11CPE matchmatch criteria
cpe:2.3:a:php:archive_tar:*:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
70.59%
Probability of exploitation in next 30 days
EPSS Percentile
99.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Aug 25, 2022
This CVE's current EPSS score of 0.7059 is in the 99th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

composerpatch availablevia ghsa
Product: pear/archive_tarFixed in: 1.4.13
github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: php:7.4-8060020220907094815.5caa48ff
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update SupportFixed in: php:7.4-8040020220907095003.d7c09045
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: php-pear-1:1.9.4-23.el7_9
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: php:7.2/php-pear
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: php:7.3/php-pear
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-php73-php-pear

Vendor Advisories (2)

composerGHSA-rpw6-9xfx-jvcxhigh

Directory Traversal in Archive_Tar

Apr 22, 2021
redhatCVE-2020-36193Moderate

Archive_Tar: directory traversal due to inadequate checking of symbolic links

Jan 27, 2021

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
github.com / pear/Archive_Tar/commit/cde460582ff389404b5b3ccb59374e9b389de916
Patch
lists.debian.org / debian-lts-announce/2021/01/msg00018.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/04/msg00007.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/42GPGVVFTLJYAKRI75IVB5R45NYQGEUR
Broken Link
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/FOZNK4FIIV7FSFCJNNFWMJZTTV7NFJV2
Broken Link
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/VJQQYDAOWHD6RDITDRPHFW7WY6BS3V5N
Broken Link
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YKD5WEFA4WT6AVTMRAYBNXZNLWZHM7FH
Broken Link
security.gentoo.org / glsa/202101-23
Third Party Advisory
debian.org / security/2021/dsa-4894
Third Party Advisory
drupal.org / sa-core-2021-001
Third Party Advisory