CVE-2020-27350 [Medium] | Integer Overflow in Advanced Package Tool

APT had several integer overflows and underflows while parsing .deb packages, aka GHSL-2020-168 GHSL-2020-169, in files apt-pkg/contrib/extracttar.cc, apt-pkg/deb/debfile.cc, and apt-pkg/contrib/arfile.cc. This issue affects: apt 1.2.32ubuntu0 versions prior to 1.2.32ubuntu0.2; 1.6.12ubuntu0 versions prior to 1.6.12ubuntu0.2; 2.0.2ubuntu0 versions prior to 2.0.2ubuntu0.2; 2.1.10ubuntu0 versions prior to 2.1.10ubuntu0.1;

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.16%	0.37%	+0.22%
2	2026-05-25	0.15%	0.16%	+0.01%
3	2026-05-22	—	0.15%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.16%

0.37%

+0.22%

2026-05-25

0.15%

0.16%

+0.01%

2026-05-22

—

0.15%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.5	3.7	[email protected]
5.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.5	3.7	[email protected]
4.6	2.0	MEDIUM	`AV:L/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	3.9	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.5

3.7

[email protected]

5.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.5

3.7

[email protected]

4.6

2.0

MEDIUM

AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

3.9

6.4

[email protected]

OS Trackers for CVE-2020-27350

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2020-27350 not yet assigned priority: Debian including 1 source packages (apt), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-27350
`ubuntu`	medium	CVE-2020-27350 medium priority: Ubuntu including 1 source packages (apt), 7 status rows across 7 suites (bionic, focal, groovy, hirsute, trusty, upstream, xenial): released 6, needs-triage 1.	https://ubuntu.com/security/CVE-2020-27350

Affected software / configurations for CVE-2020-27350

Vendor	Product	Version	Raw CPE
debian	advanced_package_tool	>= 1.2.32ubuntu0, < 1.2.32ubuntu0.2	cpe:2.3:a:debian:advanced_package_tool::::::::
debian	advanced_package_tool	>= 1.6.12ubuntu0, < 1.6.12ubuntu0.2	cpe:2.3:a:debian:advanced_package_tool::::::::
debian	advanced_package_tool	>= 2.0.2ubuntu0, < 2.0.2ubuntu0.2	cpe:2.3:a:debian:advanced_package_tool::::::::
debian	advanced_package_tool	>= 2.1.10ubuntu0, < 2.1.10ubuntu0.2	cpe:2.3:a:debian:advanced_package_tool::::::::
debian	advanced_package_tool	< 1.8.2.2	cpe:2.3:a:debian:advanced_package_tool::::::::
netapp	solidfire_baseboard_management_controller_firmware	—	cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:::::::*

References for CVE-2020-27350

URL	Tags
https://bugs.launchpad.net/bugs/1899193	Broken Link
https://security.netapp.com/advisory/ntap-20210108-0005/	Third Party Advisory
https://usn.ubuntu.com/usn/usn-4667-1	Vendor Advisory
https://www.debian.org/security/2020/dsa-4808	Vendor Advisory

URL

CVE-2020-27350 | apt integer wraparound

Exploit prediction scoring system (EPSS) score for CVE-2020-27350

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27350

Weakness enumeration for CVE-2020-27350

OS Trackers for CVE-2020-27350

Affected software / configurations for CVE-2020-27350

References for CVE-2020-27350