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CVE-2020-13844

21
FAUCET Score

CVE-2020-13844 describes a side-channel vulnerability, dubbed "straight-line speculation," affecting Arm Armv8-A core implementations. This flaw allows local attackers to potentially disclose sensitive information by exploiting speculative execution past unconditional control flow changes. Rated Medium with a CVSS score of 5.5, the vulnerability requires local user access and has a high impact on confidentiality, but no impact on integrity or availability. Currently, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arm:cortex-a32_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arm:cortex-a35_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arm:cortex-a53_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arm:cortex-a57_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:arm:cortex-a72_firmware:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
40.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 92nd percentile among its peer group of 15,937 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel

Vendor Advisories (1)

redhatCVE-2020-13844Moderate

kernel: ARM straight-line speculation vulnerability

Jun 7, 2020

References

lists.llvm.org / pipermail/llvm-dev/2020-June/142109.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2020-10/msg00039.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2020-10/msg00040.html
Mailing ListThird Party Advisory
developer.arm.com / support/arm-security-updates/speculative-processor-vulnerability
Vendor Advisory
developer.arm.com / support/arm-security-updates/speculative-processor-vulnerability/downloads/straight-line-speculation
Vendor Advisory
developer.arm.com / support/arm-security-updates/speculative-processor-vulnerability/frequently-asked-questions
Vendor Advisory
gcc.gnu.org / pipermail/gcc-patches/2020-June/547520.html
PatchThird Party Advisory