How severe is CVE-2025-43972?

CVE-2025-43972 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-43972 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-43972?

CVE-2025-43972 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-43972?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-43972 have an EU (EUVD) identifier?

Yes. CVE-2025-43972 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12348.

When was CVE-2025-43972 published?

CVE-2025-43972 was published on 2025-04-21 and last updated on 2026-06-17.

CVE-2025-43972

CVE-2025-43972 is a medium-severity vulnerability in Osrg Gobgp with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12348
Weakness: CWE-1284
Affected product: Osrg Gobgp
Published: 2025-04-21
Last modified: 2026-06-17

Description

An issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 bytes in a certain context.

Frequently asked questions

What is CVE-2025-43972?: An issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 bytes in a certain context.
How severe is CVE-2025-43972?: CVE-2025-43972 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-43972 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-43972?: CVE-2025-43972 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-43972?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-43972 have an EU (EUVD) identifier?: Yes. CVE-2025-43972 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12348.
When was CVE-2025-43972 published?: CVE-2025-43972 was published on 2025-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:*

More vulnerabilities in Osrg Gobgp

CVE-2025-43971 — High (CVSS 8.6): An issue was discovered in GoBGP before 3.35.0. pkg/packet/bgp/bgp.go allows attackers to cause a panic via a zero…
CVE-2026-42285 — High (CVSS 7.5): GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0,…
CVE-2026-41643 — High (CVSS 7.5): GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version…
CVE-2026-41642 — High (CVSS 7.5): GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0,…
CVE-2026-37461 — High (CVSS 7.5): An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial…
CVE-2026-30405 — High (CVSS 7.5): An issue in GoBGP gobgpd v.4.2.0 allows a remote attacker to cause a denial of service via the NEXT_HOP path attribute

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