CVE-2025-51823: libcsp 2.0 is vulnerable to Buffer Overflow in the csp_eth_init() function due to improper handling of the ifn

Routine

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-51823 is a medium-severity flaw (CVSS 6.5) affecting libcsp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libcsp 2.0 is vulnerable to Buffer Overflow in the csp_eth_init() function due to improper handling of the ifname parameter. The function uses strcpy to copy the interface name into a structure member (ctx->name) without validating the input length.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libcsp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-11 19:15 UTCPublished CVE record published
2026-06-17 09:35 UTCUpdated Record last modified

libcsp libcsp DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy libcsp || rpm -q libcsp || libcsp --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison libcsp sudo apt install libcsp=<VERSION_BEFORE_2.0> sudo apt-mark hold libcsp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libcsp sudo dnf downgrade libcsp-<VERSION_BEFORE_2.0> sudo dnf versionlock add libcsp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-51823?

libcsp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-51823 being exploited?

CVE-2025-51823 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-51823 affect?

CVE-2025-51823 affects libcsp. Severity is medium (CVSS 6.5). libcsp 2.0 is vulnerable to Buffer Overflow in the csp_eth_init() function due to improper handling of the ifname parameter. The function uses strcpy to copy the interface name into a structure member (ctx->name) without validating the inpu

How urgent is CVE-2025-51823?

Priority 32/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-51824 MEDIUM 6.5 DOWNGRADE libcsp 2.0 is vulnerable to Buffer Overflow in the csp_usart_open() function at drivers/usart/zephyr.c.

References

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