How severe is CVE-2025-43973?

CVE-2025-43973 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-2025-43973 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-43973?

CVE-2025-43973 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-43973?

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

Does CVE-2025-43973 have an EU (EUVD) identifier?

Yes. CVE-2025-43973 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12347.

When was CVE-2025-43973 published?

CVE-2025-43973 was published on 2025-04-21 and last updated on 2026-06-17.

CVE-2025-43973

CVE-2025-43973 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-193.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12347
Weakness: CWE-193
Affected product: Osrg Gobgp
Published: 2025-04-21
Last modified: 2026-06-17

Description

An issue was discovered in GoBGP before 3.35.0. pkg/packet/rtr/rtr.go does not verify that the input length corresponds to a situation in which all bytes are available for an RTR message.

Frequently asked questions

What is CVE-2025-43973?: An issue was discovered in GoBGP before 3.35.0. pkg/packet/rtr/rtr.go does not verify that the input length corresponds to a situation in which all bytes are available for an RTR message.
How severe is CVE-2025-43973?: CVE-2025-43973 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-2025-43973 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-43973?: CVE-2025-43973 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-43973?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-43973 have an EU (EUVD) identifier?: Yes. CVE-2025-43973 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12347.
When was CVE-2025-43973 published?: CVE-2025-43973 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

All CVEs affecting Osrg Gobgp →

Other CWE-193 (Off-by-one Error) vulnerabilities

CVE-2024-10442 — Critical (CVSS 10.0): Off-by-one error vulnerability in the transmission component in Synology Replication Service before 1.0.12-0066,…
CVE-2026-53309 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions()…
CVE-2024-38441 — Critical (CVSS 9.8): Netatalk before 3.2.1 has an off-by-one error and resultant heap-based buffer overflow because of setting ibuf[len] to…
CVE-2023-46853 — Critical (CVSS 9.8): In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used…
CVE-2023-38429 — Critical (CVSS 9.8): An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/connection.c in ksmbd has an off-by-one error in…
CVE-2022-34970 — Critical (CVSS 9.8): Crow before 1.0+4 has a heap-based buffer overflow via the function qs_parse in query_string.h. On successful…

Browse all CWE-193 (Off-by-one Error) vulnerabilities →