CVE-2020-15858

Some devices of Thales DIS (formerly Gemalto, formerly Cinterion) allow Directory Traversal by physically proximate attackers. The directory path access check of the internal flash file system can be circumvented. This flash file system can store application-specific data and data needed for customer Java applications, TLS and OTAP (Java over-the-air-provisioning) functionality. The affected products and releases are: BGS5 up to and including SW RN 02.000 / ARN 01.001.06 EHSx and PDSx up to and including SW RN 04.003 / ARN 01.000.04 ELS61 up to and including SW RN 02.002 / ARN 01.000.04 ELS81 up to and including SW RN 05.002 / ARN 01.000.04 PLS62 up to and including SW RN 02.000 / ARN 01.000.04

Published: 2020-08-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-15858 is rated Moderate Risk (42.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.28%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-15858

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.09% 0.28% +0.19%
2 2025-11-18 0.29% 0.09% -0.21%
3 2025-06-21 — 0.29% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15858

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.2 3.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 0.7 5.5 [email protected]
6.4 3.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 0.9 5.5 [email protected]
3.6 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:P/A:N 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:N)
No availability impact.
 3.9 4.9 [email protected]

Weakness enumeration for CVE-2020-15858

Affected software / configurations for CVE-2020-15858

Vendor Product Version Raw CPE
thalesgroup bgs5_firmware <= rn_02.000_\/_arn_01.001.06 cpe:2.3:o:thalesgroup:bgs5_firmware:*:*:*:*:*:*:*:*
thalesgroup ehs5_firmware <= rn_04.003_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:ehs5_firmware:*:*:*:*:*:*:*:*
thalesgroup ehs8_firmware <= rn_04.003_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:ehs8_firmware:*:*:*:*:*:*:*:*
thalesgroup ehs6_firmware <= rn_04.003_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:ehs6_firmware:*:*:*:*:*:*:*:*
thalesgroup pds5_firmware <= rn_04.003_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:pds5_firmware:*:*:*:*:*:*:*:*
thalesgroup pds6_firmware <= rn_04.003_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:pds6_firmware:*:*:*:*:*:*:*:*
thalesgroup els61_firmware <= rn_02.002_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:els61_firmware:*:*:*:*:*:*:*:*
thalesgroup els81_firmware <= rn_05.002_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:els81_firmware:*:*:*:*:*:*:*:*
thalesgroup pls62_firmware <= rn_02.000_\/_arn_01.000.04 cpe:2.3:o:thalesgroup:pls62_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-15858

cvelogic Threat Intelligence